abstract resource*
imaginary resource introduced so that its availability and activity requirement gives an extra means of control. (For example, two jobs not being worked upon simultaneously in order to obviate an accident hazard)

acceptance
the formal process of accepting delivery of a product or a deliverable.

acceptance criteria*
performance requirements and essential conditions that have to be achieved before project deliverables are accepted.

acceptance test*
formal, pre-defined test conducted to determine the compliance of the deliverable item(s) with the acceptance criteria.

accrued costs*
costs that are earmarked for the project and for which payment is due, but has not been made.

acquisition strategy
determining the most appropriate means of procuring the component parts or services of a project

activity*
task, job, operation or process consuming time and possibly other resources. (The smallest self-contained unit of work used to define the logic of a project. In general, activities share the following characteristics: a definite duration, logic relationships to other activities in a project, use resources such as people, materials or facilities, and have an associated cost. They should be defined in terms of start and end dates and the person or organisation responsible for their completion.)

activity definition
identifies the specific activities that must be performed in order to produce project deliverables.

activity duration
ativity duration specifies the length of time (hours, days, weeks, months) that it takes to complete an activity.

activity file
a file containing all data related to the definition of activities on a particular project.

activity ID
a unique code identifying each activity in a project.

activity-on-arrow network*
arrow diagram, network in which the arrows symbolise the activities.

activity on node network*
precedence diagram, a network in which the nodes symbolise the activities.

activity status
the state of completion of an activity. A planned activity has not yet started. A started activity is in progress. A finished activity is complete.

actual cost*
incurred costs that are charged to the project budget and for which payment has been made or accrued.

actual cost of work performed (ACWP)*
cumulative cost of work accrued on the project in a specific period or up to a specific stage. Note: for some purposes cost may be measured in labour hours rather than money.

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.

actual direct costs
those costs specifically identified with a contract or project. See also direct costs.

actual finish
date on which an activity was completed.

actual start
date on which an activity was started.

adjourning
the last stage of team building where the team disbands

advanced material release
a document used by organisations to initiate the purchase of long lead-time or time-critical materials prior to the final release of a design.

AND relationship *
logical relationship between two or more activities that converge on or diverge from an event. Note: the AND relationship indicates that every one of the activities has to be undertaken.

approval
the term used when an individual accepts a deliverable as fit for purpose so that the project can continue.

approval to proceed
approval given to the project at initiation or prior to the beginning of the next stage.

arrow*
directed connecting line between two nodes in a network.
o Note 1: it symbolises an activity in 'activity-on-arrow'
o Note 2: it symbolises a dependency relationship in 'activity-on-node'

arrow diagram*
See 'activity-on-arrow network'.

arrow diagram method
one of two conventions used to represent an activity in a project. Also known as activity-on-arrow or i/j method.

as late as possible (ALAP)
an activity for which the early start date is set as late as possible without delaying the early dates of any successor.

associated revenue*
that part of a project cost that is of a revenue nature and therefore charged as incurred to the profit and loss account. Note: associated revenue differs from the capital element of the project in that the capital element is taken as an asset to the balance sheet and depreciated over future accounting periods.

as soon as possible (ASAP)
an activity for which the early start date is set to be as soon as possible. This is the default activity type in most project management systems.

assumptions
statements taken for granted or truth.

audit*
systematic retrospective examination of the whole, or part, of a project or function to measure conformance with predetermined standards. Note: audit is usually qualified, for example financial audit, quality audit, design audit, project audit, health and safety audit.

authorisation
the decision that triggers the allocation of funding needed to carry on the project

authorised un-priced work
any scope change for which authorisation to proceed has been given, but for which the estimated costs are not yet settled.

authorised work
the effort which has been defined, plus that work for which authorisation has been given, but for which defined contract costs have not been agreed upon.

automatic decision event*
decision event where the decision depends only on the outcome of the preceding activities and that can be programmed or made automatic.