The South African Scoring System (SASS) is a river bioassessment method created by scientists Dickens & Graham (2002) to assess overall river health and habitat quality for organisms. miniSASS is a simple tool which can be used by anyone to monitor the health of a river. You collect a sample of macroinvertebrates (small aquatic animals) from the water, and depending on which groups are found, you have a measure of the general river health and water quality in that river. 

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Sources:

(1) http://www.minisass.org/en/

(2) Dickens, C.W., Graham, P.M., 2002. The South African Scoring System (SASS) Version 5 Rapid Bioassessment Method for Rivers. African Journal of Aquatic Science 27, 1–10.