JP7685661B1 - Gantt chart management device - Google Patents

Abstract

A Gantt chart management device that can improve the usability of a Gantt chart is provided.
[Solution] The system includes a Gantt chart identification unit that identifies a Gantt chart relating to a schedule for using resources used in the manufacture of a product, and a display unit that displays the Gantt chart identified by the Gantt chart identification unit on a display device, and the display unit displays a confirmed Gantt chart 51 and a Gantt chart 52 being edited relating to the same resource, aligned horizontally over time and side-by-side.
[Selected Figure] Figure 4

Description

The present invention relates to a Gantt chart management device.

JP 2023-46958 A (Patent Document 1) is a background technology in this technical field. This publication states that "An equipment management device according to one aspect of the present invention includes an alternative candidate equipment information generating unit that generates equipment configuration information of an alternative candidate production line using an alternative equipment for the failed production equipment when a failure is detected in any of a plurality of production equipment operating on a production line, and an alternative configuration selecting unit that generates an alternative configuration selection screen including the equipment configuration information of the alternative candidate production line and information indicating the production performance of each equipment configuration of the alternative candidate production line and displays it on a display unit, and adopts the alternative candidate production line selected via the alternative configuration selection screen as the alternative production line" (see abstract).

Another background technique is JP 2022-169081 A (Patent Document 2). This publication states that "a distributed production planning and instruction device includes a storage unit that stores production instructions that are work instructions for production elements including production equipment, production resources, and workers in a factory, production status information including the occurrence state of an abnormality in the production elements, and equipment-process relationship information that identifies other production elements that can alternatively perform the process for each process performed by the production elements, a plan change necessity determination unit that, when an abnormality occurs in the execution of a production instruction in a production element, determines that a plan change is unnecessary if the production instruction can be complied with taking into account the stoppage period of the production element caused by the abnormality, a distributed plan range calculation unit that includes other alternative production elements in the target range of the replan, and a distributed plan generation unit that replans the production instructions within the target range of the generated replan" (see abstract).

JP 2023-46958 A JP 2022-169081 A

However, the techniques disclosed in Patent Documents 1 and 2 leave room for improvement in terms of improving the usability of the Gantt chart.
Therefore, an object of the present invention is to provide a Gantt chart management device that can improve the usability of a Gantt chart.

This Gantt chart management device comprises a Gantt chart identification unit that identifies a Gantt chart relating to a usage schedule of a plurality of processing devices used in industrial activities, a resource database that accumulates information about each of the processing devices, a display unit that displays the Gantt chart identified by the Gantt chart identification unit on a display device, and an adjustment unit that, when a specific Gantt chart among the plurality of Gantt charts in a confirmed plan is moved to a tentative plan for the processing device other than the confirmed plan, adjusts the time required to process the specific Gantt chart after the move by referring to the specific Gantt chart and the resource database, wherein the display unit chronologically aligns the confirmed plan and the tentative plan for the same processing device and displays them on the display device.

According to the present invention, it is possible to provide a Gantt chart management device that can improve the usability of a Gantt chart.
Problems, configurations and effects other than those described above will become apparent from the following description of the embodiments.

1 is a block diagram showing electrical connections of a Gantt chart management system according to an embodiment of the present invention; FIG. 2 is a block diagram showing electrical connections of the Gantt chart management device. FIG. 2 is a functional block diagram of a process executed by a main storage device in the Gantt chart management device. 11 is a plan view showing an example of a screen displayed on a display of a terminal device by the Gantt chart management device. FIG. 5 is a plan view showing an example of a search result list in another case similar to that in FIG. 4 . 5 is a plan view showing an example of a search result list in another case similar to that in FIG. 4 . 5 is a plan view showing an example of a search result list in another case similar to that in FIG. 4 . 13 is a plan view showing another example of a screen displayed on the display of a terminal device by the Gantt chart management device. FIG. 13 is a plan view showing another example of a screen displayed on the display of a terminal device by the Gantt chart management device. FIG. FIG. 10 is a plan view showing a comparative example between the confirmed plan Gantt chart and the actual result Gantt chart in the example of FIG. 9 . FIG. 10 is a plan view showing a comparative example between the confirmed plan Gantt chart and the actual result Gantt chart in the example of FIG. 9 . FIG. 10 is a plan view illustrating another function of the table in FIG. 9 .

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing electrical connections of a Gantt chart management system according to an embodiment of the present invention. The Gantt chart management system is centered on a Gantt chart management device 1. The Gantt chart management device 1 is, for example, a device for managing work processes in a factory, and in this example, is a server device. Of course, the Gantt chart management device 1 can be implemented as various types of computers, such as a personal computer or a tablet. The Gantt chart management device 1, which is a server device in this example, is connected to one or more terminal devices 2 (display devices), such as a personal computer, that view data of the device and operate the device in various ways. In addition, the Gantt chart management device 1 is connected to one or more various processing devices 3 in a factory. The processing devices 3 are resources used in industrial activities, and are various devices used to manufacture products in the factory. These devices are connected via a local area network 4 or the like installed in the factory.
In addition, "industry" in industrial activity refers to activities that produce physical goods and services necessary for life. It is also a general term for agriculture, forestry, fishing, mining, manufacturing, construction, transportation and communications, commerce, finance, insurance, real estate, etc. It is also work that is necessary to make a living. The manufacturing and processing of products are examples of industrial activity.

Figure 2 is a block diagram showing the electrical connections of the Gantt chart management device. The Gantt chart management device 1 includes a central processing unit 11, a main storage device 12, an auxiliary storage device 13, and a communication control device 14. The central processing unit 11 performs various calculations and executes various controls. The main storage device 12 is a storage device that serves as a work area for the central processing unit 11. The auxiliary storage device 13 is a storage device that serves as a storage medium and stores various programs and fixed data. In particular, the auxiliary storage device 13 stores a Gantt chart management program 15. This Gantt chart management program 15 is a program that causes the main storage device 12 to execute various processes described below. The Gantt chart management program 15 may be downloaded from the Internet or the like and set up in the auxiliary storage device 13, or it may be read from a storage medium such as a DVD and set up in the auxiliary storage device 13. In the auxiliary storage device 13, a Gantt chart database (DB) 16 that stores data on various Gantt charts and a resource database (DB) 17 that stores information on each resource (described below) are constructed. The communication control device 14 communicates with the terminal device 2, processing device 3, etc. via the local area network 4, etc.

However, in the above-mentioned Patent Documents 1 and 2, when a Gantt chart is used for work management within a factory, there is room for improvement in terms of improving the usability of the Gantt chart by making the difference between the planning stage of a work and its execution status immediately clear. Therefore, the following describes an example of the display process of such a user-friendly Gantt chart.

Figure 3 is a functional block diagram of the processing executed by the main memory device in the Gantt chart management device. Based on the Gantt chart management program 15, the main memory device 12 executes the functions of the Gantt chart specification unit 21, display unit 22, and adjustment unit 23. The specific processing executed by each of these units is described below.

Figure 4 is a plan view showing an example of a screen displayed on the display of a terminal device by the Gantt chart management device. The Gantt chart identification unit 21 of the Gantt chart management device 1 executes a function of identifying a Gantt chart related to a schedule of resource usage used in the manufacture of a product. In this example, the Gantt chart identification unit 21 searches for a Gantt chart in the Gantt chart DB 16 by operating the terminal device 2, and the result can be displayed on the screen of the terminal device 2 by information processing performed by the display unit 22. However, the present invention is not limited to this, and for example, the display unit 22 may display a list of various Gantt charts registered in the Gantt chart DB 16 on the terminal device 2, and the user may select a desired Gantt chart from the list.

In FIG. 4, the search conditions 30 can input display type 31, production plan group 32, process group 33, item number 34, production lot No. 35, display period 36, and reflection target 37 as search conditions. In display type 31, the type of Gantt chart to be searched is input. In production plan group 32, the group of the product to be produced is input. Production plan group 32 is a required input field. In process group 33, the group of the process of the product to be produced is input. In item number 34, the item of the product to be produced is input. In production lot No. 35, the production lot No. of the product to be produced is input. In display period 36, the start and end of the schedule period in the Gantt chart to be searched is input. In reflection target 37, it is selected whether the Gantt chart to be searched is the provisional registration 38 or the confirmed registration 39. This is also a required input field. A provisional registration is a Gantt chart registered in a provisional state, and a confirmed registration is a Gantt chart in which the processing of the product has already been confirmed in the schedule. By inputting search conditions into these fields and clicking a search button 41 , search results according to the search conditions are displayed in a search result list 42. The displayed contents of the search result list 42 can be cleared by clicking a clear button 43.

In the search example of Figure 4, "Resource Gantt Chart (Definite Plan/Tentative Plan)" is selected for display type 31, "Heat exchange part processing" is selected for production plan group 32, and provisional registration 38 is selected for reflection target 37, and the search is performed. Here, "resources" includes not only equipment that processes and produces products, such as processing device 3, but also groups of on-site workers when processing and production are mainly performed manually. In short, resources are resources such as machines and human resources that are directly used to process and produce products. Also, while it says "Definite Plan/Tentative Plan," a confirmed plan refers to a plan according to which it has been confirmed that products will be produced. A tentative plan refers to a plan that is still in the process of being planned as a schedule for product production.

The search results are displayed in a search result list 42 by the display unit 22. In this example, the search result list 42 shows different items such as a Gantt chart in different colors. In the drawings of the present application, the different colors are displayed by different types of hatching, etc.
In the search result list 42, the resources 44 according to the search conditions are listed on the vertical axis, such as "Heat Exchanger PR High-Speed Press No. 1" and "Heat Exchanger PR High-Speed Press No. 2", and the final plans (a series of horizontally long Gantt charts 51) and tentative plans (a series of horizontally long Gantt charts 52) of those resources 44 are displayed vertically aligned on the horizontal axis in a chronological order by information processing of the display unit 22. Although not shown in FIG. 4 and subsequent figures, a vertical line indicating the current time is also displayed in the search result list 42. Note that "chronologically" means that events are arranged in chronological order along the time axis by displaying events (Gantt charts) with earlier times on the left side of the screen compared to events (Gantt charts) with later times.

In "Heat Exchange Breath PR High-Speed Press No. 1", a Gantt chart 51 of a confirmed plan and a Gantt chart 52 of a tentative plan are displayed one above the other, aligned chronologically from left to right. That is, the Gantt chart 51 with an earlier time is displayed to the left of the Gantt chart with a later time. Of the Gantt charts 51, Gantt chart 511 relates to a confirmed plan that has already been completed in "Heat Exchange Breath PR High-Speed Press No. 1". Gantt chart 512 relates to a confirmed plan that is currently being worked on in "Heat Exchange Breath PR High-Speed Press No. 1". Gantt chart 512 is displayed with the same content in both Gantt chart 51 and Gantt chart 52, arranged one above the other. Gantt chart 53 shows a tentative plan whose execution has not yet been confirmed, and is displayed as "not started". Each Gantt chart can be manually input by the user using a GUI such as a mouse, but the vertical parallel display of Gantt charts 51 and 52 is performed by information processing by the display unit 22. For resources 44 that only have Gantt charts of tentative plans for which execution has not yet been confirmed and no Gantt charts of confirmed plans, only the Gantt charts of tentative plans for which execution has not yet been confirmed are displayed (see "Heat Exchange Breath PR High Speed Press No. 2" and "Heat Exchange Breath PR High Speed Press No. 3"). The same is true for resources 44 that have Gantt charts of confirmed plans but no Gantt charts of tentative plans for which execution has not yet been confirmed.

For "Heat Exchange Press UD High Speed Press No. 1", Gantt chart 54 is a confirmed plan Gantt chart in which work cannot be performed due to a breakdown of the resource, a worker's toilet break, a mold change during production, etc. This causes the plan of Gantt chart 55 behind Gantt chart 54 of the confirmed plan for "Heat Exchange Press UD High Speed Press No. 1" to be delayed. In this case, the work scheduled for "Heat Exchange Press UD High Speed Press No. 1" may be possible to be performed by "Heat Exchange Press PR High Speed Press No. 2" or "Heat Exchange Press PR High Speed Press No. 3". In this case, the user can drag Gantt chart 55 to change it to a confirmed schedule or tentative plan schedule for "Heat Exchange Press PR High Speed Press No. 2" or "Heat Exchange Press PR High Speed Press No. 3", etc.

In this case, the PR high-speed press and the UD high-speed press have different specifications. Therefore, even if the same work is performed by the PR high-speed press and the UD high-speed press, the time required for each may differ. Information regarding the specifications of each resource 44 is stored in the resource DB 17. Therefore, the adjustment unit 23 refers to the schedule of the original Gantt chart 55 and the resource DB 17, adjusts the required time of the Gantt chart 55 newly moved to "Heat exchanger PR high-speed press No. 2" or "Heat exchanger PR high-speed press No. 3", etc., and records and displays it as a new Gantt chart.

Furthermore, when such schedule changes are made, it may be necessary to change the Gantt chart of an item in the Gantt chart of the changed final plan or tentative plan. In this case, the user can drag the Gantt chart of the item in question to change the schedule. However, by clicking the reallocation button 68, the adjustment unit 23 can also automatically move the Gantt chart of the item in question to a specified position.

FIG. 5 is a plan view showing an example of a search result list in another case similar to FIG. 4. In the resource 44, the Gantt chart 51 of the confirmed plan and the Gantt chart 52 of the tentative plan are displayed vertically for the "large press I press No. 1". In this case, the plans are confirmed and the currently working plans are displayed vertically with the same contents. However, in this currently working plan, the "large press I press No. 1" cannot be used due to a malfunction or the like, so the user inputs the Gantt chart 57 using a GUI such as a mouse to clarify that the "large press I press No. 1" cannot be used until 16:00. This allows the user to input and display the changed schedule. In other words, the remaining work shown in the Gantt charts 51 and 52 after the "large press I press No. 1" is interrupted due to a malfunction or the like is to be performed by the "large press I press No. 2", and this is shown in the display column of the "large press I press No. 2", which is one of the resources 44, as the Gantt chart 58 of the confirmed plan and the Gantt chart 59 of the tentative plan.

6 and 7 are plan views showing an example of a search result list in another case similar to that shown in FIG. 4. As shown in FIG. 6, in this example, a Gantt chart 61 of a plan that was confirmed and was being worked on by the "large press I press No. 1" which is a resource 44, becomes infeasible due to a breakdown of the resource or the like. The period during which the plan is infeasible is shown by inputting a Gantt chart 62. That is, since the latter half of the Gantt chart 61 overlaps with the Gantt chart 62, it is understood that the work corresponding to the Gantt chart 61 overlapping with the Gantt chart 62 is infeasible. Previously, the "large press I press No. 2" which is a resource 44 only displayed the Gantt chart 63 which shows a confirmed schedule that has not yet been started, but the user inputs the remaining work plan of the Gantt chart 61 which became infeasible on the "large press I press No. 1" as a Gantt chart 64 in the display field for the "large press I press No. 2". Since this plan overlaps with the unstarted plan of the Gantt chart 63, the Gantt chart 63 is moved to behind the Gantt chart 64 to create the Gantt chart 65. This movement may be performed automatically by the adjustment unit 23 as described above. In this case, the specifications of the "large press I press No. 1" and the "large press I press No. 2" may differ. Therefore, the adjustment of the duration of the Gantt charts 64 and 65 is performed by the adjustment unit 23 by referring to the schedules of the Gantt charts 64 and 65 and the resource DB 17, as described above.

Returning to FIG. 4, the Confirm button 66 is a button that the user clicks to confirm and register the information they have entered on the screen as a confirmed plan. The Register button 67 is a button that the user clicks to register the information they have entered on the screen as a tentative plan. The Re-allocation button 68 is a button that the user clicks to instruct the system to automatically move the Gantt chart, as described above.

As shown in Fig. 7, by pressing the Confirm button 66 in Fig. 4, the contents of the inputs and the like as described above with reference to Fig. 6 are displayed on the screen. Gantt chart 71 shows a confirmed plan, and Gantt chart 72 shows an unconfirmed plan. When the plan in Fig. 6 is changed, the display of Gantt chart 61 disappears, and in Fig. 7, Gantt charts 71 and 72 showing the changed contents of the plan in Fig. 6 are displayed. The reason why the contents of Gantt chart 71 and Gantt chart 72 are exactly the same is because those tasks are not completed, but are in progress or have not yet been started.
Note that time is shown in 10-minute increments in Fig. 6, and time is shown in 15-minute increments in Fig. 7. The start time of Gantt chart 64 in Fig. 6 and the end time of Gantt chart 65 match the start time and end time of Gantt chart 71 in Fig. 7.

Figure 8 is a plan view showing another example of a screen displayed on the display of a terminal device by the Gantt chart management device. When the same reference numerals as those in Figures 7 and earlier are used in the figures following Figure 8, they refer to the same parts, etc. as in the examples in Figures 7 and earlier. This example shows an example of a screen display performed by entering "Resource Gantt chart (confirmed plan/actual results)" in display type 31 and performing a search. Here, "actual results" refers to the actual extent to which the confirmed plan has actually been completed.

In FIG. 8, for each resource 44, the display unit 22 displays a confirmed Gantt chart 81 for the same resource 44, a Gantt chart 82 of work results, and a Gantt chart 83 of the resource's operating status, aligned vertically and horizontally over time. In the Gantt chart 83 of the resource's operating status, the color of the Gantt chart 831 indicates that the resource is operating, the color of the Gantt chart 832 indicates that the resource is on standby, the color of the Gantt chart 833 indicates that the power supply of the resource is off, and the color of the Gantt chart 834 indicates that the resource has an abnormality (FIG. 8 shows that an abnormality has occurred seven times in the operating resource). The information of the Gantt chart 83 of the resource's operating status may be recognized by the Gantt chart management device 1 based on information from the processing device 3 (FIG. 1), which is the resource 44, or may be manually input by the user.

In the case of "Heat Exchange Press UD High Speed Press No. 1", the Gantt chart 85, which is superimposed on the Gantt chart 81 and the Gantt chart 82, indicates that the work cannot be performed due to the equipment failure of the resource (manual input by the user). On the other hand, in the resource operation status Gantt chart 83, the color of the Gantt chart 834 indicates that the "Heat Exchange Press UD High Speed Press No. 1" is in an inoperable state (automatic detection by the Gantt chart management device 1). From the time difference between the Gantt chart 85 and the Gantt chart 834, it is possible to confirm the difference between the timing of receiving the abnormality notification signal of the resource and the report by the worker of the start of the countermeasure measures against the failure of the resource. In this case, it is possible that the response due to the occurrence of the failure of the resource was prioritized, or that the worker was unable to respond and the start of the measures was delayed. From these differences, it is possible to verify the difference between the report content from the worker and the reality, and to gain awareness.

After the breakdown period of the above-mentioned "Heat Exchange Press UD High Speed Press No. 1," work resumed, as shown in Gantt charts 86 and 87. However, in the resource operation status Gantt chart 83, multiple short Gantt charts 834 (seven short Gantt charts 834) show that abnormalities of the resource occurred repeatedly for very short periods during that period. Therefore, it can be seen that the cause of the time difference between the confirmed Gantt chart 81 and the work performance Gantt chart 82 is the frequent stoppage of the resource, even if each time was for a relatively short period.

Figure 9 is a plan view showing another example of a screen displayed on the display of a terminal device by the Gantt chart management device. In this example, it is an example of a screen when searching for "Order Gantt Chart (Fixed Plan/Actual Results)". An "Order Gantt Chart" is a Gantt chart for product orders. This is data showing the progress status of product orders. For example, an order might be to manufacture 100 units of product A with a delivery date of XX. Processing each order generally involves multiple processes such as machining, assembly, and inspection.

In this case, the search result list 42 has the orders 90 listed on the vertical axis and the time axis on the horizontal axis. For each order, the display unit 22 displays a Gantt chart 91 of the confirmed plan and a Gantt chart 92 of the actual results, arranged vertically with the time axes aligned on the left and right.
For the order "CAR101 OD05322-r production quantity: 3," the processes of "processing,""assembly," and "inspection" are required, but Gantt chart 911 showing "processing" in Gantt chart 91 of the confirmed plan is delayed in Gantt chart 92 of the results, as shown in Gantt chart 921. Therefore, it can be seen in Gantt chart 92 that the subsequent processes of "assembly" and "inspection" are also delayed, as shown in Gantt charts 912 and 913.

For the order "CAR101 OD05321 Production quantity: 3," comparing Gantt chart 91 of the confirmed plan with Gantt chart 92 of the results, it can be seen that the first process in Gantt chart 914 has been completed in correspondence with Gantt chart 924. However, it can be seen that the processes corresponding to Gantt charts 925 and 926 in Gantt chart 91 of the confirmed plan have not yet started in Gantt chart 92 of the results. Looking at this table provides a starting point for investigating why the processes corresponding to Gantt charts 925 and 926 have not been carried out.

Figures 10 and 11 are plan views showing a comparison between the Gantt chart of the confirmed plan in the example of Figure 9 and the Gantt chart of the actual results. In the example of Figure 10, it can be seen that when the second and subsequent processes are able to keep to their work hours, a delay in the first process leads to a delay in the entire order.

In the example of Figure 11, the Gantt chart of each process in the actual results Gantt chart 92 indicates "Delayed," making it easier to see the difference between the actual results and the initial plan.

Fig. 12 is a plan view for explaining other functions of the table in Fig. 9. For example, a user places a cursor on the Gantt chart 91 of a confirmed plan and right-clicks to display a pop-up image 94. This pop-up image 94 shows details of the Gantt chart where the cursor is placed, as well as information such as that the start of the work has been delayed by 60 minutes and that 30 minutes have elapsed since the work started. This allows the user to grasp the delay status of each work.
Next, the effects of the present embodiment will be described.

4, the display unit 22 displays a finalized Gantt chart 51 and a Gantt chart 52 being edited, which relate to the same resource, one above the other, with the chart aligned chronologically from left to right. This makes it easier to plan future work and to display the Gantt chart 52.
Furthermore, when a specific schedule of the confirmed Gantt chart 51 is moved to the Gantt chart 52 being edited, the adjustment unit 23 adjusts the time required to process the schedule after the move by referring to the schedule and the resource DB 17, and reflects the adjusted time in the Gantt chart after the move. This makes it easy to reschedule by easily incorporating differences in resource specifications.

Furthermore, the adjustment unit 23 automatically moves a specific schedule of the confirmed Gantt chart 51 to a specified position of the Gantt chart 52 being edited. This makes it easier for the user to adjust the schedule.

As shown in the example of FIG. 8, the display unit 22 displays a confirmed Gantt chart 81 for the same resource, a Gantt chart 82 of work results, and a Gantt chart 83 of the resource's operating status, aligned vertically and horizontally over time. This allows the user to easily understand at a glance the relationship between the resource's operating status and the schedule progress.

9, the display unit 22 displays a Gantt chart 91 of confirmed order information and a Gantt chart 92 of work results, aligned vertically and horizontally over time, so that the user can easily grasp the progress of the processing of accepted orders.
The present invention is not limited to the above-mentioned embodiment, but includes various modified examples. For example, the above-mentioned embodiment has been described in detail to easily explain the present invention, and the present invention is not necessarily limited to those including all of the described configurations. In addition, it is also possible to add, delete, or replace a part of the configuration of each embodiment with another configuration.

Furthermore, the above-mentioned configurations, functions, processing units, processing means, etc. may be realized in hardware, in part or in whole, for example by designing them as integrated circuits. Furthermore, the above-mentioned configurations, functions, etc. may be realized in software by a processor interpreting and executing a program that realizes each function. Information on the programs, tables, files, etc. that realize each function can be stored in a memory, a recording device such as a hard disk or SSD (Solid State Drive), or a recording medium such as an IC card, SD card, or DVD.

In addition, the control lines and information lines shown are those that are considered necessary for the explanation, and not all control lines and information lines in the product are necessarily shown. In reality, it can be considered that almost all components are connected to each other.
In addition, in Figures 1 and 2, the Gantt chart management device 1 is shown connected to the terminal device 2 via a network, but a single smartphone or a single tablet may serve as both the Gantt chart management device 1 and the terminal device 2.

1 Gantt chart management device 17 Resource database (DB)
21 Gantt chart specifying unit 22 Display unit 23 Adjustment unit

Claims (2)

a Gantt chart specification unit that specifies a Gantt chart relating to a usage schedule of a plurality of processing devices used in industrial activities;
a resource database storing information about each of the processing devices;
a display unit that displays the Gantt chart specified by the Gantt chart specifying unit on a display device;
an adjustment unit that, when a specific Gantt chart among the plurality of Gantt charts in a confirmed plan is moved to a tentative plan for the processing device other than the confirmed plan, adjusts a time required for processing the specific Gantt chart after the move by referring to the specific Gantt chart and the resource database;
Equipped with
The display unit displays the final plan and the tentative plan for the same processing device on the display device in a chronological order. The Gantt chart management device according to claim 1 , wherein the adjustment unit also moves a specific Gantt chart in the confirmed plan to a predetermined position in the tentative plan .

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