Effort

Effort is The number of labor units required to complete a schedule activity or work breakdown structure component, often expressed in hours, days, or weeks. See also duration.

Definition

According to the PMI Lexicon of Project Management Terms,

Effort. The number of labor units required to complete a schedule activity or work breakdown structure component, often expressed in hours, days, or weeks. See also duration.

According to Cost Accounting by Horngren, Datar, Rajan (14th edition), Effort. Exertion toward achieving a goal.