Schedule Deviation means a lack of convergence between the baseline plan of a project and the actual achievements obtained on certain date. It can be derived by comparing the budgeted value of work scheduled in a specified time (its planned value) against the budgeted value of work actually accomplished on that date. Also it can be derived through defining a percentage of work completed (in terms of results and deliverables) on a specific date against the percentage which was expected to be completed on the same date. Schedule Deviations must be accurately and promptly reviewed and investigated to discover a cause.
Schedule Deviation should be analyzed and handled in terms of:
- Delays: what work exactly has been delayed? The project managers need to discover what areas and tasks have suffered from delays badly (to figure out what has been failed and why);
- Impacts: how severe the deviation is and how straightly it will grow up into further project delay (impossibility to meet the due date);
- Productivity problems: why some tasks have been failed, even though a company has invested into planning them? The project managers need to know what weak links they have in the plan, which conditions add to risks, and what project resources appear ineffective and why;
- Resolution: the project managers need to come up with a solution early as possible to minimize overall impact of delays to the project schedule;