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A test is split in five phases, Setup, Measurement, Analysis, Reporting and Filing (SMARF). For each phase the information to be stored is described. This can be a textual (text) or numerical field (var), or a column (column).
During the test, after each phase the correctness and completeness of the data can be checked against the Testdefinition.
Reference
In 2009 Deltares released a paper on the STREAM Concept.