JP3791279B2 - Medium and apparatus storing event chain analysis diagram creation support program - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention easily analyzes the event that finally becomes a problem and makes it easy to grasp the structure of the chain of event groups that can cause the final problem event (final event), that is, FTA (Fault Tree Analysis). It is related with the technology to assist so that it can be implemented.
[0002]
[Prior art]
For example, the final event that a composite tube breaks occurs when a crack occurs or deforms. The phenomenon that the crack occurs is caused by large input, material deterioration in the environment, or insufficient material strength. The phenomenon that the input is large occurs when the axial load is large, the torque is large, or the external force load is large. The phenomenon that the external force load is large is caused by hitting an object during mounting, hitting an object during mounting, hitting an object after mounting, or hitting an object after mounting. The final event that the composite tube breaks can be caused by, for example, an event that a crack occurs (primary event), and the primary event can be caused by an event that the input is large (secondary event), for example. The secondary event may be caused by, for example, an event that the external force load is large (third event), and the third event may be caused by, for example, an event of hitting an object (fourth event) during mounting. There is a possibility.
[0003]
When the apparatus, method, or system handled is complicated, it becomes difficult to understand the relationship between the final event and the chain of events that can cause the final event. Therefore, FTA was developed.
[0004]
In FTA, the final event is located at the apex, and the primary event group that can cause the final event is connected to the final event with a logical symbol, and the secondary event that can cause the primary event for each primary event. Groups are connected by logical symbols, and in order, for each higher-order event, a chain analysis diagram (FT diagram) of events in which lower-level event groups that can cause the higher-level events are connected by logical symbols is created. Since this FT diagram visually displays the complex chain relationship between the final event and the event group that can cause it, the structural relationship of the event group that exists behind the final event is created by creating this FT diagram. It becomes clear.
[0005]
Conventionally, this FT diagram has been created by a person who has a deep knowledge of the device, method or system to analyze the FTA technique, and created the FT diagram manually over time.
[0006]
[Problems to be solved by the invention]
The FT diagram is a very useful tool for logically analyzing problems, but it takes a long time to create, and is generally handled by a busy person who has a deep knowledge of the device, method or system. Often times, it takes time to create an FT diagram. Therefore, the present invention implements a technique for supporting the FT diagram creation process and assisting the creation of an FT diagram in a short time.
[0007]
[Means, actions and effects for solving problems]
In the present invention, in order to support the creation of an event linkage analysis diagram (FT diagram), a display prompting entry of a lower event group for a higher event is displayed, and the input lower event group is associated with the upper event at that time. A medium storing a program for supporting the creation of a chain analysis diagram of events by diagramming the chain of upper events and lower event groups stored in this manner And equipment Was created.
[0008]
When this program is executed on a computer, the person in charge of the problem has only to input the lower event group according to the display prompting the input of the lower event group that may cause the problem event. Is created. In other words, since the computer stores the upper and lower associations of the input event group, after the input is completed, the input event group is hierarchically arranged corresponding to the upper and lower associations. The FT diagram is efficiently created in a short time by combining the input work of the person in charge of analysis and the computer processing.
[0009]
According to this technology, a person in charge of analyzing a problem can concentrate on insight into lower event groups that can be caused by making use of his / her knowledge, and can create a high-quality FT diagram in a short time. In other words, if the troublesome task of adding event groups while considering the layout at the time of drawing, etc. is continued for a long time, some events are likely to be lost, but insight into the event groups that are caused by using this technology Therefore, a high-quality FT diagram can be obtained.
According to this technology, a high-quality FT diagram can be created in a short time. Therefore, it is necessary to create a FT diagram and to understand the structure of the problem. It is possible to take an appropriate measure after creating an FT diagram and structurally grasping the problem for various problems that have been applied.
[0010]
It is preferable that a program that displays a message prompting entry of a lower-level event group of the selected lower-level event when one of the input lower-level event groups is selected is added to the basic program. .
If this program is added, the person in charge of analysis can proceed to analyze the problem event in a top-down manner, and it is easy to cover all the event groups that can be attributed to the FT diagram.
[0011]
It is also preferable that a program is added to display a message prompting the input of a peer event other than the upper event when all the lower factor groups are input.
If this program is added, the person in charge of the problem can proceed to analyze the problem event in a bottom-up manner, and it is easy to efficiently input the event group while following the human natural thought process.
[0012]
Furthermore, it is preferable that a program for searching for related events from the input lower event group is added.
When this program is added, multiple analysts can input and collect insights of events that can be caused independently, and then search for related events and organize them. It becomes easy to create an extremely high-quality FT diagram that can be obtained by comprehensively producing the above-mentioned ironmaking in a short time.
[0013]
Furthermore, when one of the input event groups is selected, and another one event is selected, a program for reassociating one selected event with a lower event of the other event may be added. preferable.
When this program is added, the person in charge of the problem must first input a group of events that can be caused without worrying about the upper / lower relationship, and then sort out the upper / lower associations between the events. Therefore, it is easy for a plurality of analysts to jointly create an FT diagram.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
First, some features of embodiments of the present invention are listed.
(Mode 1) In claim 1, a program for displaying a list of subject groups and predicate groups of an event and selecting a subject and a predicate from the list and supporting input of the event is added.
(Form 2) In form 1, the list is prepared for each technical field.
(Form 3) In Form 1, a program for registering a new term in the list is prepared.
(Embodiment 4) In claim 1, a program for storing an inappropriate term group for describing a factor and displaying the inappropriate term when the stored inappropriate term is input is added.
(Embodiment 5) A program having both the additional programs of claims 2 and 3 and selecting and starting one of them is provided.
(Mode 6) An additional program according to claim 5 is included, and a program for starting the program by an operation of an analysis worker is included.
(Mode 7) A program for calculating the occurrence probability of the upper event when the occurrence probability of the lowest event is input is added.
[0015]
【Example】
FIG. 1 shows a system configuration of a computer in a state where a program storage medium created according to the present invention is stored in the computer.
This computer has a CPU 2 and is connected to a C / D drive 4, a keyboard 6, a mouse 8, a display device 10, a printer 12, and a storage device 14. The C / D drive 4 is used when a program stored in the program storage medium 13 (specifically, a C / D disk) of this embodiment is read and the program is installed in this computer. In addition, it is used to store necessary data.
[0016]
When the program is installed, various storage areas conceptually shown in FIG. 1 are prepared in the storage device 14 of the computer. That is, the FT diagram creation support program 16 is stored in a part of the storage device 14. In addition, an area 32 storing a term list to be referred to when an event is input by executing this program, an area 34 storing an inappropriate term list, a part of an FT diagram (this is a block FT diagram) An area 36 for storing the collection of (1)) and an area 38 for storing the previously created FT diagram.
[0017]
The storage area of the FT diagram creation support program 16 stores a program for executing various processes to be described later. In particular, a TD subprogram started when supporting a process of creating an FT diagram in a top-down manner. 18. BU subprogram 20 activated when supporting the process of creating the FT diagram in the bottom-up method, PI subprogram 22 activated when supporting the process of creating the FT diagram in the post-it method, A printing program 30 that is activated when the printer 12 prints the FT diagram is included. The PI subprogram 22 includes a program 24 for searching for an input event group, a program 26 for replacing an event once input with another description, and a program 28 for correcting the association between events.
[0018]
The term list 32 includes a subject group and a predicate group that are frequently used to describe an event, and the term group is stored for each technical field so that the selection operation can be easily performed by selecting from a small number of term groups. Has been. For example, when analyzing an electrical system, a list storing terms that are frequently used when describing events related to electricity is selected and used. In this way, it is possible to select a term from a list in which electrical terms are concentrated, instead of selecting a term from a long list in which electrical terms, mechanical terms, and chemical terms are mixed. This list can be expanded by analysts, and can be evolved to be easy to use while using this program.
[0019]
The inappropriate term list 34 stores an inappropriate term group for describing an event. For example, when a sub-event of “material is bad” is input in analyzing a problem event that a composite tube is broken. The person who is planning the countermeasure by looking at the created FT diagram understands that “impurities are mixed in the material”, understands that “the material is deteriorated”, or “the material selection is inappropriate. It may be understood that `` a material with a lower grade than the ordered material has been delivered '', and the interpretation is too wide. It can be said that it is not appropriate to describe. Alternatively, it is not appropriate to describe an event with the subject “engine is” to analyze engine problems. Inappropriate term list 34 stores a group of inappropriate terms for describing an event, and the analysis operator determines that the event has been inadvertently described and entered and calls attention. Used for.
The stored contents of the term list 32 and the inappropriate term list 34 are expanded and updated by the user.
[0020]
FIG. 2 shows an example of the created FT diagram. Zero in the figure is a problem event to be analyzed, that is, a final event. The logical symbol shown to the right indicates the logical relationship between the upper and lower events, in this case the OR symbol, so a zero final event is a 1-1 primary event or a 1-2 event. Indicates that the relationship is caused by one of the primary events. On the other hand, an AND symbol is shown on the right side of event 2-2, indicating that event 2-2 has a relationship that occurs when both event 3-4 and event 3-5 occur. Yes. The event indicated by the diamond is a non-deployment event, and corresponds to an event that cannot be further developed into a lower-level event due to lack of information, incomplete analysis technology, or the like. An event indicated by an ellipse in the figure is a basic event, and corresponds to a basic event that cannot be further expanded to lower events due to its nature. Non-deployment events and basic events are the lowest events.
[0021]
The number preceding the hyphen in each frame indicates the order of the event in the hierarchical chain of events, and in the FT diagram, the upper event is displayed on the left and the lower event is displayed on the right. In the FT diagram, a format in which a higher-level event is displayed on the upper side and a lower-level event is displayed on the lower side is also possible. When the computer is operated according to a program and the FT diagram is printed by the printer 12, It is possible to select whether to print the FT diagram in the vertical writing format or in the horizontal writing format.
[0022]
The FT diagram in FIG. 2 shows that the final event indicated by zero is “composite tube breaks”, and the final event is “1)“ crack occurs ”or 1-2“ the tube is deformed ” The primary event of 1-1 “cracking” is caused by one of the primary events of “Yes”, 2-1 “Input is large”, or 2-2 “Material deteriorates in the environment” ”Or 2-3“ material strength is insufficient ”due to the secondary event, 2-1“ input is large ”secondary event is 3-1“ external force load is large ” ”, 3-2“ torque is large ”, or 3-3“ axial load is large ”, and 3-1“ external force load is large ” 4-1 “I bump into an object during loading”, 4-2 “I bump into an object during loading”, or 4-3 “Impact after loading” Due to the quaternary event of either "impact" or 4-4 "impact after mounting", the secondary event of "2-2. It occurs when both the event “temperature is high” and the tertiary event 3-5 “breaking the protective layer” occur, and the tertiary event 3-5 “breaking the protective layer” This indicates that it is caused by a quaternary event of “the protective layer is thin” or “no underlayer” of 4-6.
It is confirmed that the structural relationships of event groups that are complex and difficult to understand when written in text are displayed visually on the FT diagram, making it easier to understand.
[0023]
FIG. 3 shows the order of input of events when expanding into event groups in a top-down manner. The final event is input first, the primary event that can be the cause is input next, and the lower events are input in the order of the secondary event and the tertiary event. It has been empirically confirmed that when an event is input in this manner, the event is easily incorporated without omission.
[0024]
FIG. 4 shows another typical input order. This is called bottom-up in the present invention. When a problem occurs, a normal person is likely to gain insight into one of the chain of events. Input order 1 to 5 corresponds to the input process of this single chain. When this work is completed and up to one lowest event is entered, the analysts are encouraged to enter insights into the other lowest events, making it easier to see other events. . This corresponds to 6 to 8 in the input order. When the entry of the lowest event has been completed, the analyst is encouraged to insightly enter the higher-level event other than the event previously input (input in rank 4) In the order of ranks 9 to 10, the order of ranks 11 to 12, and the order of rank 13 are input. In this case, for example, the top-down method described in FIG.
It has been empirically confirmed that the bottom-up method is easy to become familiar with human senses because FT diagrams can be obtained in a short time because analysis is performed centering on a single chain that is easy for humans to gain insight. .
[0025]
The above-mentioned top-down method and bottom-up method are suitable for a single or a small number of analysis workers to input events systematically. On the other hand, when several or more people are involved in the structural analysis of a problem while having a meeting, it is easier to input the event group that causes the problem in a brainstorming manner apart from the upper and lower associations. And it is easier to collect public knowledge by reconstructing the input event group and organizing it into a hierarchical structure. This method is called a post-it method in the present invention.
[0026]
The FT diagram creation support program of this embodiment supports all input methods of event input in the top-down method, event input in the bottom-up method, and event input in the post-it method.
[0027]
5 to 7 show display contents displayed on the display device 10. The left side of the screen is an area for displaying input event groups, and the right side is a display area for tools that support input. In principle, the input is performed with the mouse 8 and the missing part is input with the keyboard 6.
[0028]
When this support program is activated, the top-down, bottom-up, and post-it methods can be selected, and FIG. 5 shows a screen when the top-down display 40 is clicked with the mouse 8. This screen allows events to be entered from the top to the bottom.
[0029]
In order to support the input of an event, a subject group list 48 and a predicate group list 52 are displayed, and if a term suitable for describing an event to be input is included in this list, click on the term. As a result, the subject of the event to be input is displayed in the area 46 and the predicate is displayed in the area 50. If there is no appropriate term in the list, the subject is input from the keyboard 6 while the area 46 is clicked, and the predicate is input from the keyboard 6 while the area 50 is clicked. When an event to be input is described in the areas 46 and 50, the described event is input by clicking the icon 56 displayed as set. For an event to be displayed highlighted on the FT diagram, click the highlight icon 54 and click the setting icon 56.
[0030]
First, the final event is input according to the above input procedure. When the final event is input, the final event that has been input is displayed in the area indicated by zero on the left side of the screen. The numbers shown on the left side of the event display area indicate the display order, and the final event zero is displayed first.
[0031]
When inputting a lower event after inputting one event, the next icon 62 is clicked. In this state, the above operation is repeated to input an event. The event input in this way is the first primary event, and is displayed in the area indicated by 1-1 on the left side of the screen.
[0032]
When inputting a lower event, a logical symbol column 42 is clicked to select one of logical symbols such as AND or OR. In addition, the column 44 is used to specify the type of event to be input, for example, whether or not it is the lowest event.
[0033]
When inputting another event of the same peer after inputting one lower event, the event insertion icon 58 is clicked. In this state, the above operation is repeated to input an event. The event input in this way is the second primary event, and is displayed in the area indicated by 1-2 on the left side of the screen. FIG. 5 shows the case where the seventh event is input and then the eighth event is input, so that the area 1-2 is displayed on the lower side, but the third input 2 When the first primary event 1-2 is first displayed, it is displayed in the line immediately below the area 1-1.
[0034]
As described above, when inputting a lower event, the next icon 62 is clicked. Then, the first input event (1-1 in this case) among the events of the order input immediately before is highlighted, and the input of the lower event is prompted. In this state, the analysis worker gains insight into an event that can cause the 1-1 event and inputs the event. While continuing to input the peer event, click the event insertion icon as described above. In this way, events 2-1 to 2-3 shown in the display order 4 to 6 are input. Immediately after events 2-1 to 2-3 are input, event 2-2 is displayed on the line immediately below event 2-1, and event 2-3 is displayed on the line immediately below event 2-2. . As event 2-3 is input from event 2-1, the display line of event 1-2 is shifted downward.
[0035]
When the input of the peer event is completed, the next icon 62 is clicked to input the lower event. Then, the first input event (2-1 in this case) is highlighted among the events of the order input immediately before that, and is highlighted by inputting the event in this state. The seventh event 3-1 is input and displayed as a lower event of the event 2-1.
[0036]
When the next icon 62 is clicked prior to inputting the eighth event, the 3-1 event is highlighted and the next input event is associated with the subordinate event of the 3-1 event. In this case, the next input event is 4-1 and is displayed at the position indicated by 62A. If the event insertion icon 58 is clicked before the 8th event is input, the highlighted display will remain at 2-1, and the next input event will be the same as the 3-1 event at the bottom of the 2-1 event. Associated with the event. In this case, the next input event is 3-2 and is displayed at the position indicated by 58A.
With the event 2-1 highlighted, the entry of the lower event group for the event 2-1 is completed, and then the entry of the lower event of the event 2-2, which is the same as the event 2-1, is entered. If so, the next event icon 60 is clicked. Then, the highlight display shifts from event 2-1 to 2-2, and input of an event lower than event 2-2 is prompted. When the next event icon 60 is clicked prior to inputting the eighth event, the next input event is associated with 3-3 and displayed at the position indicated by 60A.
[0037]
Any one of the displays 62A, 58A, and 60A indicated by broken lines in FIG. 5 is displayed depending on which of the icons 58, 60, and 62 is clicked and input. In either case, the entry is made with the high-order event highlighted. That is, event 4-1 is input with event 3-1 highlighted, event 3-2 is input with event 2-1 highlighted, and event 3-3 is event 2- 2 is input in a highlighted state. In either case, the analyst is prompted by the highlighted event display and continues to input the inferior event that may cause the event, while inputting the sub-event while associating it with the upper event. can do.
[0038]
FIG. 6 shows a display when the person in charge of analysis clicks the bottom-up icon 64. In this state, an event insertion icon 58, a next icon 64, and a definition end icon 66 are displayed to specify the hierarchy of the event to be input next. The definition end icon 66 is clicked when the input of the lowest event is completed during the input operation of one chain. Until the definition end icon 66 is clicked, a lower event is input by the next icon 64. After this definition end icon 66 is clicked, the next icon 64 prompts the input of a higher event.
[0039]
When the bottom-up method is selected, the analysis operator inputs the final event, next icon 64 clicks, primary event 1-1 input, next icon 64 clicks, secondary event 2-1 input, next icon 64 clicks, The third event 3-1 input, the next icon 64 click, and the fourth event 4-1 input are repeated to complete one chain until the lowest event 4-1 is reached. When the entry of the lowest event is completed, the definition end click 66 is clicked.
[0040]
When the input of one lowest event is completed, the next event is input using the event insertion icon 58. As a result, in the case of FIG. 6, events 4-2 and 4-3 are input.
When the next click 64 is clicked and the next event is input at this stage, the input of another event is prompted in the same order as the upper event (in this case, 3-1) of the event that has been input so far. When the event insertion icon 58 is clicked and the next event is input, the event that has been input so far (in this case, 4-1 to 4-3) is input.
[0041]
In either case, the entry is made with the high-order event highlighted. That is, the event 4-4 is input with the event 3-1 highlighted, and the event 3-2 is input with the event 2-1 highlighted. In either case, the analyst will be prompted to highlight the event display and continue to enter the inferior event that may be the cause of the event, associating the lower event with the higher event. Can be input.
[0042]
FIG. 7 shows a state where the post-it icon 68 is clicked. In this case, a plurality of analysts can arbitrarily input a group of events that can cause the final event in a brainstorming manner. The state inputted in this way is shown in (B), and all inputted sub-events are associated with peers. At the time of this input, a plurality of analysts can input brainstorming-related events, and can examine and input events that cannot be insighted when analyzing alone. This post-it method supports the task of collecting wisdom and analyzing problems.
[0043]
In the event group input in this manner, substantially the same event is likely to be input repeatedly with similar expressions. In order to check this duplicate input, a search program is incorporated in this support program. When this program is started, the display shown on the right side of FIG. 7 appears. Therefore, the person in charge of analysis inputs the subject or predicate to be searched for an event that is expected to be duplicated (the input terms are displayed in the areas 70 and 72, respectively), and clicks the search icon 74. Then, a list of search results is displayed in the area 76. Thereby, a related event is retrieved from the input event.
[0044]
Of the retrieved event group, for an event in which another event is described and is inappropriate to be collected, click on the event and click on click 78 to be removed. As a result, the specified event is removed from the following processing targets.
[0045]
Only the event group which is not removed in the area 76 is displayed. In this state, the person in charge of analysis inputs an appropriate term in the areas 80 and 82 to describe a group of events, and clicks the replace icon 84. Through the above processing, a group of events input in duplicate with similar expressions is organized into one event. FIG. 7A schematically shows the process, and the event 76 that has been input in a similar expression is replaced with one event.
[0046]
The analyst can reorganize the simple enumeration structure of events shown in FIG. 7B to the hierarchical structure shown in FIG. In this case, the reassociation icon 86 is clicked.
[0047]
In this state, it is possible to click two events on the screen (B) shown on the left side of the screen and re-associate one with the other lower event. That is, as shown in (B), when event 1-2 is clicked first, then event 1-5 is clicked, event 1-2 that was clicked first is subordinate to event 1-5 that was clicked next Reassociated with the event. (C) shows the result of re-association (the number in the parenthesis is the event number before re-association), the event that was originally 1-2 was changed to 2-1, and the original was 1-3 to 1-5 The events are arranged from 1-2 to 1-4, and the re-associated event 2-1 is re-associated with the sub-event of the re-associated event 1-4. By repeating the above processing, the person in charge of analysis can change from the isotopic listing structure of FIG. 7B to the hierarchical structure illustrated in FIG. 7C and further to FIG.
[0048]
In the program of this embodiment, an occurrence probability calculation program is further prepared. In the FT diagram illustrated in FIG. 2, if the occurrence probabilities of the lowest event 4-1 to 4-4 are known, the occurrence probability of the event 3-1 can be calculated. In this embodiment, this calculation program is prepared. By inputting the occurrence probability of the lowest event, the occurrence probability of each higher event is calculated and the calculated probability is displayed in the FT diagram. .
[0049]
When the diagram input icon is clicked at the stage where the re-association process of the input of the event or the input event group as necessary has been completed, the computer is illustrated in FIG. 2 according to the information relating the input event group and the event group Create an FT diagram. The created FT diagram can be printed by the printer 12. In printing, vertical writing and horizontal writing can be selected, and a format in which events from the top to the bottom are expanded from left to right and a printing format in which the events are expanded from top to bottom can be selected.
[0050]
The created FT diagram can be stored in the created FT diagram file 38, and can be referred to or modified as necessary in the future.
It is possible to store a part of the FT diagram and use it in the future. For example, events 3-1 to 4-1 to 4-4 in FIG. 2 are stored as blocks, and another FT diagram is created. At this time, a new FT diagram can be created more efficiently by utilizing already created blocks.
[0051]
The present invention is not limited to the technology of the embodiments described above, and can be used in various ways within the scope of the technology described in the embodiments and the claims. In particular, the program storage medium is not limited to a narrowly-defined medium used for distributing the program, and includes any means for storing the program in a duplicated or executable manner. is there.
[Brief description of the drawings]
FIG. 1 is a hardware configuration diagram when a program according to an embodiment is installed.
[Fig. 2] Example of FT diagram
[Figure 3] An example of the input order when inputting events from the top down
[Fig.4] An example of input order when inputting events bottom-up
FIG. 5 shows an example of an input screen when inputting events from the top down.
[Fig. 6] Example of input screen when inputting events bottom-up
[Fig. 7] An example of the input screen when inputting events post-it

Claims (12)

The final event is located at the apex, the primary event group that can cause the final event is connected to the final event with a logical symbol, and the secondary event group that can cause the primary event is logically associated with each primary event. In order to support the creation of a chain analysis diagram of events in which the lower event groups that can be the cause of the upper event are connected with logical symbols in the following order
The display prompts the user to input the lower event group for the upper event, searches for the related event from the input lower event group, and stores the lower event group organized based on the search result in association with the upper event group at that time. A medium that stores a program that supports the creation of a chain analysis diagram of events by diagramming the chain of upper events and lower event groups stored in this manner. The final event is located at the top, and the primary event group that can cause the final event is connected to the final event by a logical symbol, and the secondary event group that can cause the primary event is logically linked to each primary event. In order to support the creation of a chain analysis diagram of events in which the lower event group that can be the cause of the upper event is combined with the logical symbol in the following order
The display prompts the user to input the lower event group for the upper event, and when one of the input event groups is selected and the other one event is selected, the selected event is changed to the lower event of the other event. A medium in which a program is stored that reassociates with an event and charts the chain of higher-order events and lower-order event groups re-associated in this way and supports creation of a chain analysis diagram of events. To support the creation of a chain analysis diagram of events in which lower events that can cause higher events are combined with logical symbols for higher events,
The display prompts the user to input the lower event group for the upper event, searches for the related event from the input lower event group, and stores the lower event group organized based on the search result in association with the upper event group at that time. A medium that stores a program that supports the creation of a chain analysis diagram of events by diagramming the chain of upper events and lower event groups stored in this way. To support the creation of a chain analysis diagram of events in which lower events that can cause higher events are combined with logical symbols for higher events,
The display prompts the user to input the lower event group for the upper event, and when one of the input event groups is selected and the other one event is selected, the selected event is changed to the lower event of the other event. A medium in which a program is stored that reassociates with an event and charts the chain of higher-order events and lower-order event groups re-associated in this way and supports creation of a chain analysis diagram of events. 5. A program for displaying a message prompting input of an event group lower than the selected lower event when one of the input lower event groups is selected is added. Any medium. The medium according to any one of claims 1 to 4, further comprising a program for displaying a message prompting the input of a peer event other than the upper event when the entire lower event group is input. The final event is located at the top, and the primary event group that can cause the final event is connected to the final event by a logical symbol, and the secondary event group that can cause the primary event is logically linked to each primary event. In order to support the creation of a chain analysis diagram of events in which the lower event group that can be the cause of the upper event is combined with the logical symbol in the following order
The display prompts the user to input the lower event group for the upper event, searches for the related event from the input lower event group, and stores the lower event group organized based on the search result in association with the upper event group at that time. An apparatus in which a program that supports the creation of a chain analysis diagram of events by diagramming the chain of upper events and lower event groups stored in this manner is stored. The final event is located at the top, and the primary event group that can cause the final event is connected to the final event by a logical symbol, and the secondary event group that can cause the primary event is logically linked to each primary event. In order to support the creation of a chain analysis diagram of events in which the lower event group that can be the cause of the upper event is combined with the logical symbol in the following order
The display prompts the user to input the lower event group for the upper event, and when one of the input event groups is selected and the other one event is selected, the selected event is changed to the lower event of the other event. An apparatus in which a program is stored that reassociates with an event and supports the creation of a chain analysis diagram of the event by diagramming the chain of upper events and lower event groups re-associated in this way. To support the creation of a chain analysis diagram of events in which lower events that can cause higher events are combined with logical symbols for higher events,
The display prompts the user to input the lower event group for the upper event, searches for the related event from the input lower event group, and stores the lower event group organized based on the search result in association with the upper event group at that time. An apparatus in which a program that supports the creation of a chain analysis diagram of events by diagramming the chain of upper events and lower event groups stored in this manner is stored. To support the creation of a chain analysis diagram of events in which lower events that can cause higher events are combined with logical symbols for higher events,
The display prompts the user to input the lower event group for the upper event, and when one of the input event groups is selected and the other one event is selected, the selected event is changed to the lower event of the other event. An apparatus in which a program is stored that reassociates with an event and supports the creation of a chain analysis diagram of the event by diagramming the chain of upper events and lower event groups re-associated in this way. 11. A program for displaying when the user selects one of the inputted lower event groups and prompts the user to input a lower event group of the selected lower event group is added. Any device. The apparatus according to any one of claims 7 to 10, wherein a program is added to display that prompts the input of a peer event other than the upper event when all of the lower event groups are input.

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