Clear formula
EAC equals recognised actual cost plus the expected remaining cost.
Forecasting
CostGrid can display actual, ETC, EAC and variance positions inside a project. The current release has no owner/reason/version workflow for entering or revising ETC, so the controls below describe the required next step.
Where control breaks
The CostGrid control path
EAC equals recognised actual cost plus the expected remaining cost.
A future mutation must record owner, date, reason and version for every manual ETC change without erasing prior values.
Compare approved budget with EAC and trace the adverse drivers by WBS and cost code.
Operational outcome
Start with one live project, keep the control trail intact, and expand only after the workflow proves useful.