Can scheduling systems deal with variable shop times breakdo

Solution

Scheduling system is planned in such a manner that it has already added some overhead time not necessarily defined for any of the given task given above like variable shop times, breakdown of equipment, changing requirements, and other uncertainties or any other convention. but sometimes the overhead time which is added, if not estimated properly creates some trouble. and things like variable shop times or your equipment breakdown or the requirement of the customer is changing in very short time span (Customer\'s requirements are dynamic) then the project will be delivered later than what is expected. We cannot say that scheduling becomes unmanageable, the right way to put it should be the scheduling becomes unordered. In order to prevent such situations one must be proactive not reactive means act before any such situation is occurred but not when the situation already arises. Like for example Breakdown of equipment overhead time can be saved to avoid such situations by doing regular check of the system (machine), or clearly define in the contract clause that how many time maximum you will accept change of requirements, so the customer will not change the requirements as mood swing he will think properly and then seek to change the requirements.