Time Control - Evaluation of Impact of Scope Variation
Success of a construction project is in part dependent on the scope definition, scope management and scope control. After the initial definition of the scope, its management and control is dependent on the change management process. Changes made to the scope of the project may impact the schedule of the project.
6.3.2.1 Revising baseline
The time control process, once completed, provides the necessary information and inputs which leads to revising the baseline schedule. After the changes in scope are identified and approved and delays have been identified and quantified the baseline shall be revised.
Before revising the baseline, the original schedule baseline shall be saved to store historical scheduling data.
6.3.3 Delay Analysis
Delay analysis, looks at every delay in the schedule at the activity level to determine where, when and why the delay occurred and identifying the stakeholder responsible for the same. The cost implications of any delay shall be calculated. The time responsibility and cost implications may be determined by variance analysis and trend analysis using weighted concept
(S-curve) given in Annex C and earned value management technique given in Annex B.
6.3.4 Schedule Specific Risk Analysis
During the time planning and time control subfunctions, it is important to analyze schedule risks, specially on construction projects with high uncertainty in the underlying scheduling data. Both qualitative and quantitative processes are involved in the schedule risk analysis process. After the risk identification step is complete, the qualitative process shall be undertaken.
The qualitative process shall involve subjective’s experience based input on common likelihood factor and common impact factor. The product of these two provides an identification of the risk associated with various risk factors. After the qualitative process, the baseline schedule may normally be utilized to perform a quantitative analysis of schedule risks. Programme evaluation and review technique (PERT) and monte carlo simulation technique commonly used, may be utilized to perform schedule risk analysis. At the completion of the qualitative and quantitative processes, decision makers shall have a plan to monitor and control project risks associated with the project schedule.