| rami18 <coco@coco.com>: Jul 02 03:18PM -0400 Hello.. PERT is coming to you.. I have decided to implement PERT (The program evaluation and review technique), here is the result, please read carefully what follows, i have also included a 32 bit and 64 bit windows executables called PERT32.exe and PERT64.exe (that take the file, with a the file format that i specified bellow, as an argument) inside the zip, it is a very powerful tool. PERT (The program evaluation and review technique) for Delphi and Freepascal Version: 1.0 Authors: Amine Moulay Ramdane that have written PERT, Robert Sedgewick, Kevin Wayne. Email: aminer@videotron.ca Description: The program (or project) evaluation and review technique, commonly abbreviated PERT, is a statistical tool, used in project management, which was designed to analyze and represent the tasks involved in completing a given project. First developed by the United States Navy in the 1950s, it is commonly used in conjunction with the critical path method (CPM). PERT permits also to calculate: - The longest path of planned activities to the end of the project - The earliest and latest that each activity can start and finish without making the project longer - Determines "critical" activities (on the longest path) - Prioritize activities for the effective management and to shorten the planned critical path of a project by: - Pruning critical path activities - "Fast tracking" (performing more activities in parallel) - "Crashing the critical path" (shortening the durations of critical path activities by adding resources) PERT is a method of analyzing the tasks involved in completing a given project, especially the time needed to complete each task, and to identify the minimum time needed to complete the total project. It incorporates uncertainty by making it possible to schedule a project while not knowing precisely the details and durations of all the activities. It is more of an event-oriented technique rather than start- and completion-oriented, and is used more in projects where time is the major factor rather than cost. It is applied to very large-scale, one-time, complex, non-routine infrastructure and Research and Development projects. PERT and CPM are complementary tools, because "CPM employs one time estimate and one cost estimate for each activity; PERT may utilize three time estimates (optimistic, expected, and pessimistic) and no costs for each activity. Although these are distinct differences, the term PERT is applied increasingly to all critical path scheduling You have to have a java compiler, and you have first to compile the java libraries with the batch file compile.bat, and after that compile the Delphi and Freepascal test1.pas program. Here is the procedure to call: procedure solvePERT(filename:string;var info:TCPMInfo;var finishTime:system.double;var criticalPathStdDeviation:system.double); The arguments are: The filename: is the file to pass, it's is organized as: The first line is the number of jobs, the rest of each of the lines are: three time estimates that takes the job (optimistic, expected, and pessimistic) and after that the number of precedence constraints and after that the precedence constraints that specify that the job have to be completed before certain other jobs are begun. info: is the returned information, you can get the job number and the start and finish time of the job in info[i].job and info[i].start and info[i].finish, please look at the test.pas example to understand. finishTime: is the finish time. criticalPathStdDeviation: is the critical path standard deviation. I have provided you with two other functions to calculate the probabilities using the Normal distribution using the critical path standard deviation and using the best estimate of completion time of the critical path, here they are: function NormalDistA (const Mean, StdDev, AVal, BVal: Extended): Single; function NormalDistP (const Mean, StdDev, AVal: Extended): Single; You pass the best estimate of completion time to Mean, and you pass the critical path standard deviation to StdDev, and you will get the probabilities of the value Aval or between the values of Aval and Bval. I have also included a 32 bit and 64 bit windows executables called PERT32.exe and PERT64.exe (that take the file, with a the file format that i specified above, as an argument) inside the zip, it is a very powerful tool, you need to compile CPM.java with compile.bat before running them. You can download this library from: https://sites.google.com/site/aminer68/pert-the-program-evaluation-and-review-technique-for-delphi-and-freepascal Have fun with it ! Language: FPC Pascal v2.2.0+ / Delphi 7+: http://www.freepascal.org/ Operating Systems: Windows, Required FPC switches: -O3 -Sd -dFPC -dFreePascal -Sd for delphi mode.... Required Delphi switches: -$H+ -DDelphi For Delphi XE-XE7 use the -DXE switch Thank you, Amine Moulay Ramdane. |
| rami18 <coco@coco.com>: Jul 02 03:20PM -0400 Hello, I have posted here because i have also included a 32 bit and 64 bit windows executables called PERT32.exe and PERT64.exe (that take the file, with a the file format that i have specified , as an argument) inside the zip, it is a very powerful tool. Thank you, Amnine Moulay Ramdane. |
| rami18 <coco@coco.com>: Jul 02 06:03PM -0400 Hello.. My PERT library uses a CPM algorithm that uses Topological sorting to render CPM a linear-time algorithm for finding the critical path of the project, so it's fast. You can download version 1.02 from: https://sites.google.com/site/aminer68/pert-the-program-evaluation-and-review-technique-for-delphi-and-freepascal Thank you, Amine Moulay Ramdane. |
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