OUM Core Components

1. Task: Lowest unit of work. Smallest traceable item on project work plan and forms basis of work breakdown structure. Results in a new or revised work product.
2. Work Product: Output of a task. Required to meet project objectives. Need not be a document. May or may not be a deliverable.
3. Dependency: Define relationships between tasks or activities.
4. Process: Usually a sub project and can span more than one phase
5. Phase: Temporary grouping of tasks. Natural point for milestones and checkpoints.
6. Lifecycle Milestone: Occurs at phase boundaries. Assure objectives of phase are met. Assure readiness of project to move to next phase.
7. Activity: Next Level below a phase. Groups related tasks. Results in milestone or deliverable. May be from different processes. Begin and end in the same phase.

There are 4 types of dependencies:

1. Predecessors
2. Successors
3. Overlap
4. Gap

There are 5 Lifecycle Milestones defined in OUM. Their acronym are LO, LA, IOC, SP and SO.

1. LO = Lifecycle Objective
2. LA = Lifecycle Architecture
3. IOC = Initial Operating Capability
4. SP = System Production
5. SO = Sign-off