Activity Tasks or work effort that will be completed over time. Control Account A management control point for planning and control as it represents the work associated with one project work breakdown structure element that is assigned to one responsible organizational entity. Planning Package A logical aggregation of future work within a control account that has not yet been planned in detail at the work package or task level. Summary Level Planning Package Future work effort assigned to a higher level account. Work Package A task or set of tasks performed within a control account. Mutually Defined Mutually agreed upon planning level code.