Hi Anish,
Activities depend on the type of project:
1. Fresh Implementation (On-Demand)
2. Re-implementation (On-Demand/On-Premise)
3. Upgrade (On-Premise to On-Premise)
4. Migration (On-Premise - On-demand)
5. Maintenance and Support - (On-Demand/On-Premise)
So which type of project you are looking at, also activities differ by different modules involved in the project.
Regards
Vilas