What are the needs assessment, process evaluation, outcome evaluation, and efficiency evaluation, respectively?

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Needs assessment is used to determine whether the target population needs, understands, and accepts the proposed program elements.
Process evaluation determines whether program activities have been implemented as intended and resulted in certain outputs.
Outcome evaluation measures the program's effects on the target population by assessing the progress in the outcomes that the program is to address.
Efficiency evaluation measures what resources are being used and their costs compared to outcomes from a cost-benefit perspective.