10 points Save Answer The critical chain project management approach advocates that activity times be estimated and scheduled at a completion probability of 50% for purposes of estimating project completion time. Since the probability of activity completion in the scheduled time is just 50%, how does the project manager make allowances for activity time over-runs (an activity going beyond the scheduled time)? The project manager obtains estimates of the most likely probability completion times for all activities, and keeps a time safety stock amounting to the difference between the the former and the 50% completion times probability estimates, across all activities. This pool is maintained as a general time reserve from which time is allowed for individual delayed activities, after scrutiny, and on the request of the team leader responsible for that activity. The project manager keeps a reserve time safety stock for each activity, based on 90% probability completion time estimate, and allows delays upto that point for each activity. The project manager obtains estimates of the 90% probability completion times for all activities, and keeps a time safety stock amounting to the total difference between the the former and the 50% completion times probability estimates, across all activities. This pool is maintained as a general time reserve from which time is allowed for individual delayed activities, after scrutiny and on the request of the person responsible for that activity. The project manager seeks updates from the activity team leaders at regular intervals and updates the activity times on a dynamic basis