Planning defines WHAT and HOW, while Scheduling defines WHEN and WHO.
Because projects are of finite duration and most use of unique work processes, the planning of a project is particularly important. In the planning phase, the project manager and team create a formal document to guide the project team as they execute the project.
The plan includes the sum of the scope, deliverables, tasks and services to be provided as a project. The statement of project scope (a formal document) should include a list of deliverables, a list of project objectives, and a description of project success criteria, such as cost, quality, and schedule measures.
On the other hand, the scheduling includes the process of determining when project activities will take place depending on defined durations and precedent activities. Schedule constraints specify when an activity should start or end based on duration, predecessors, external predecessor relationships, resource availability, or target dates.
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