WBS, EPS & Types
P6 Activity Types (Six) — Not MSP Task Type
Six P6 activity types; not MSP task type; WBS Summary is a TASK, not a WBS band
What a planner means
Activity type is how dates and duration are calculated, not how much work there is. Oracle Professional: six types; every activity has one. Different from duration type (Duration ↔ Units ↔ Units/Time). See P6 Duration Types (Four) vs Project Task Types (Three).
XER: TASK.task_type (Oracle label: Activity Type). Default: PROJECT.def_task_type. Stored codes are not in the XER column map. Do not invent TT_* tokens.
The six (Oracle UI)
| Type | Calendar / duration | Oracle |
|---|---|---|
| Task Dependent | Activity calendar, not resource calendars | Control the duration yourself (cure concrete). Assigned resources follow the activity calendar. |
| Resource Dependent | Resource calendars | Duration can move with resource availability. Use when people work on their own calendars. |
| Level of Effort | Duration from predecessors/successors | Ongoing admin. See Level of Effort (Task.task_type). |
| Start Milestone | Zero duration, no resources | Beginning of a phase. |
| Finish Milestone | Zero duration, no resources | End of a phase. See Start vs Finish Milestones. |
| WBS Summary | Rollup of activities that share a WBS level | Earliest start and latest finish of that group. Not a live rollup — calculated when you schedule. Constraints and Expected Finish are not allowed. This is still a TASK, not a PROJWBS node. See P6 WBS. |
Integration API lists display strings Task Dependent, Resource Dependent, Level of Effort, Milestone, WBS Summary, and also has FINISH_MILESTONE. UI still shows Start vs Finish milestone as two types. Do not collapse them in a viewer.
Microsoft Project
Project has no six-way activity type. A “milestone” is usually a 0-duration task. A “summary” is outline indent, not a WBS Summary activity. Task vs resource calendars is a different switch (task calendar optional). LOE does not exist.
Do not map task_type to MSPDI Task Type (0/1/2 — those are Fixed Units/Duration/Work). Must not draw a WBS Summary activity as a WBS band. Must not treat WBS Summary dates as live until the file is rescheduled.