| Acceptance | The formal process of accepting delivery of a product or deliverable. |
| Acceptance Criteria | Performance requirements and essential conditions have to be achieved before project deliverables are accepted. |
| Accountability | The obligation to report on one’s actions. |
| Activity | Actions are taken or work performed through which inputs, such as funds, technical assistance and other types of resources are mobilized to produce specific outputs. |
| Activity Duration | Activity duration specifies the length of time (hours, days, weeks, months) that it takes to complete an activity. This information is optional in the data entry of an activity. |
| Actual Dates | Actual dates are entered as the project progresses. These are the dates that activities really started and finished as opposed to planned or projected dates. |
| Actuals | The cost or effort incurred in the performance of tasks. Also, the dates tasks have been started or completed and the dates milestones have been reached. |
| Alternatives | A number of different solutions and approaches must be evaluated and chosen to attain the objectives of a project. |
| Analogous Estimating | Estimating using similar projects or activities as a basis for determining the effort, cost, and/or duration of a current one. Usually used in Top-down Estimating. |
| Approach Statement | A high-level description of how the project will accomplish its goals and objectives. |
