Control Elements are the lowest level of detail used when managing budgets and cost
Control Accounts are activities or small groups of similar work with a defined scope, schedule, and budget. The Work Breakdown Structure (WBS) provides a structure for your control accounts and can be used for cost management, and reporting within a project.
Control Accounts are activities or small groups of similar work with a defined scope, schedule, and budget. Earned Value Management (EVM) is performed at the Control Account level.
Budgets, Actuals, and Forecasts are managed at a lower level, called Control Elements.