According to the rule of shortest processing time, tasks are being sequenced in a manner that the task which has the lowest processing time gets selected at first. This is then followed by the task which has the next minimum processing time and so on. This is known as sequencing of the shortest processing time.
Once the importance of these tasks which need to be performed begin to vary, another rule known as Weight Scheduling Time (WSPT) is being used. This method is applied to tasks of greater weight which have a higher importance. The processing time is divided by the weight factor with an aim of achieving the inclination to move an important job.
Here the numbers within brackets indicate the position of various tasks as per the most favorable sequence.