Question

NO HANDWRITTEN ANSWERS PLEASE

Define and describe the function and interrelationship of a drum, drum buffer, and a capacity constraint buffer in CCPM. Use example to apply CCPM to multiple project portfolios by formal step

Answer 1

A drum can be seen as a system-wide constraint that is mainly used to create the pattern for the entire system, effective control of the entire system or project collections
Drum buffer can be seen as added safety which can be used in the project immediately before using the resources in order to avoid their uses
A capacity constraint can be seen as a safety margin to distinguish the different applications of the same resources with the help of various project schedules.
When it comes to a single project, in order to prevent the idling of the project drum, added safety margin is provided which is called drum buffer. With the increasing number of project, the firm needs a drum to be protected by the capacity buffer

The formal steps necessary to apply CCPM to multiple project portfolios are stated below=

1. Look for the different the various forces that are behind the various project schedules
2. Fully utilize the resource constraint with the help of critical chain schedule
3. Using the subordination of the different project schedules with the help of project scheduling on the basis of drum schedule, development of the critical chain having the capacity constraint buffers (CCBs) between the individual project schedules, conflict resolution and using drum buffer for each project
4. Determine the capacity of constraint resource and improving the capacity of the drum
5. Use step 2 and implement the entire process to have improved flow