User:Z.barani/sandbox

S-Curve and OS-Curve ( Project Management)
S-Curve S Curve about project management, is defined as a tool to illustrate the distribution of expenses, working hours and other expected quantities against the expected period of time. Using the title S is generalized because the formed distribution of quantities against time has a shape similar to S in English. This means that this distribution takes a rough shape of straight line and in the middle has a curve shape. An S-Curve is defined as "a display of cumulative costs, labour hours or other quantities plotted against time." The name derives from the S-like shape of curve, flatter at the beginning and end and steeper in the middle that is typical of most projects. The beginning represents a slow, deliberate by accelerating start, while the end represents a deceleration as the work runs out"7. This Curve can be assumed as a picture of the project path by use of which managers focus on the compatibility of the predicted path and estimating the future condition of the project. One method to doing that is that we assign weight to each of the activities. Completing any of them, we calculate their weights and judge with respect to the total weights of all of the activities up to a specific time (Status Date). OS-Curve After S-Curve being recognized as one of the most efficient tools, in order to, prevent deviation in projects, to manage a project; it was determined that with the improvement of this curve some more useful results can be purveyed to the project managers. We are going to improve this curve. To simplify the words this curve will be mentioned as “OS-Curve". ICMIE 127-6  To draw OS-Curve, first with the application of weighing methods for all the little defined activities in WBS, we calculate a certain weight. Then with the usage of predicting the project progress in specific time intervals, we draw S-Curve. Next, we distinguish the non-critical activities from critical ones and calculate their weight against zero. In such circumstances, we face the work breakdown structure in which just the critical activities are weighed. Surely, the obtained integrative weight will be less than 100%. To compensate this deficiency, we will increase the weight of critical activities in certain proportion, as the integrative weight increases to 100. The best job to do in such circumstances is to use proportional ratio. After this stage, by calculating the project progress again in previous time intervals, we draw the progress curve of critical path next to S-Curve. To identify the project milestones, we also compute the project progress based on the initial specified weights till the time of any milestone happening and demonstrate them as diamond, square or circle on the plan S-Curve. To calculate the progress there is no need to calculate the progress for both paths and it would be enough to draw the project progress based on the plan progress path of S-Curve