Baseline

“A set of measurements before any intervention starts (after any initial ‘run-in’ period with no intervention), with which subsequent results are compared.”

https://www.nice.org.uk/article/pmg20/chapter/glossary#baseline

Benchmark

“evaluate (something) by comparison with a standard: we are benchmarking our performance against external criteria”

http://www.oxforddictionaries.com/definition/english/benchmark

Benefit

A benefit is a measurable improvement resulting from change considered to be advantageous by at least one stakeholder that contributes to an organisational change. Intangible benefits relate to issues such as improvements in health and well-being and/or quality of life.

Budget Impact Analysis (BIM)

Aims to estimate the change in expenditure to a specific budget holder and primarily assesses financial affordability of an intervention.