Rapid evidence assessments or reviews allow for a structured and rigorous search, as well as a quality assessment of the uncovered evidence, but are not as extensive and exhaustive as a systematic review. They often provide a brief summary of the evidence discovered, so that informed, evidence-based, conclusions can be drawn. They tend to be used in making informed decisions often by policy makers or are used to justify the need for further research.
Crawford, C., Boyd, C., Jain, S., Khorsan, R. and Jonas, W. (2015) 'Rapid Evidence Assessment of the Literature (REAL©): Streamlining the systematic review process and creating utility for evidence-based health care.' BMC Research Notes, 8(1) pp. 631-640.