Một cách tiếp cận phổ biến với các tình huống như vậy là để xây dựng một cuộc khảo sát trước và sau. Sự thay đổi sẽ đo lường giá trị của dự sách các giả định, rủi ro, và những trở ngạiPhần thứ năm của POS xác định bất kỳ | 216 Chapter 1 Report resource effort hours day spent and remaining in-progress work only . Whereas the preceding numbers report calendar time these numbers report labor time over the duration of the activity. There are two numbers. One reports labor completed over the duration accomplished. The other reports labor to be spent over the remaining duration. Report percent complete. Percent complete is the most common method used to record progress because it is the way we tend to think about what has been done in reference to the total job that has to be done. Percent complete isn t the best method to report progress though because it is a subjective evaluation. When you ask someone What percent complete are you on this activity what goes through his or her mind The first thing he or she thinks about is most likely What percent should I be followed closely by What s a number that we can all be happy with To calculate the percent complete for an activity you need something quantifiable. At least three different approaches have been used to calculate the percent complete of an activity Duration Resource work Cost Each of these could result in a different percent complete So when we say percent complete what measure are we referring to If you focus on duration as the measure of percent complete where did the duration value come from The only value you have is the original estimate. You know that original estimates often differ from actual performance. If you were to apply a percent complete to duration however the only one you have to work with is the original estimated one. Therefore percent complete is not a good metric. Our advice is to never ask for and never accept percent complete as input to project progress. Always allow it to be a calculation. Many software products will let you do it either as an inputted value or as a calculated value. The calculated value that we recommend above all others is one based on the number of tasks actually completed in the activity
