WhentheSPIscheduleperformanceindexislessthan1.doc

When the SPI schedule performance index is less than 1, said schedule delays, than the actual progress schedule delay; When the schedule performance index of SPI is more than 1, said ahead of schedule, the actual progress faster than schedule. When the progress performance index of the SPI is equal to 1, said the actual schedule is equal to the schedule. Third, deviation analysis method Earned value method of evaluating curve method, the order of time, the vertical expenses. BCWS curve for planning engineering budget cost curve, said the project investment cost in accumulated over time, until the end of the project reached its maximum value, because in an s-shaped curve shape, so it is called the S curve. Has ended BCWT engineering budget cost ACWP and completed the engineering practice, is also the progress of the time parameter, according to the project to promote increased, is also a s-shaped curve. Curve method in the process of project implementation, the plan of engineering budget cost BCWP BCWS, has finished project budget, has finished project actual cost ACWP three parameters of the three curves can be formed. CV is BCWP minus ACWP, the difference between the two parameters, reflect the cost of project progress deviation. SV equals BCWP minus BCWS, the difference between the two parameters, reflect the progress of the project progress deviation. Curve using the earned value analysis can evaluate cost schedule, shown in the figure of the project, the CV is less than 0, the SV is less than zero, which means that the project execution, namely cost overruns, schedule delays, the corresponding remedial measures should be taken. For example: a mechanical and electrical line project earned value analysis 1 P357 1 h420095 costs a comprehensive control progress Project cost is a comprehensive progress control is to use earned value analysis method will be the task of the project and cost factor decomposition, multi-level, elaboration and specific schedule,