Level of Effort (LOE) Activity

A Level of Effort activity represents ongoing support work — project management, quality assurance, contract administration, health and safety supervision — whose duration expands or contracts to match the activities it is supporting. Unlike discrete activities, which have a defined start, end, and deliverable, an LOE activity runs in parallel with a phase of work and has no independent end point. In earned value management, LOE activities earn value in proportion to their duration consumed: if 50% of the phase has passed, 50% of the LOE budget is earned. This means LOE activities never show a cost variance — their earned value always tracks their planned value by construction.

The earned value treatment of LOE activities is their most significant limitation. Because they automatically track plan, including too many LOE activities in an EVM system inflates the earned value and makes performance look better than it is. A programme that classifies most of its cost as LOE will show a healthy SPI and CPI even when discrete deliverables are late and over budget. Best practice is to minimise the proportion of total budget assigned to LOE activities — AACE guidance suggests that LOE should not exceed 10–15% of total budgeted cost on a well-structured programme.

The practical test for whether an activity should be LOE or discrete is: does this activity produce a specific deliverable that can be independently assessed for completion? If yes, it is a discrete activity. If the work just continues for as long as the project runs and the 'deliverable' is the service itself — site supervision, monthly reporting, ongoing design management — then LOE is appropriate. The decision matters for reporting integrity: every discrete activity that is mis-classified as LOE is a performance signal that the EVM system will not show.