So, in a tertiary transfusion service department, how much competency assessment needs to be done? If we group the tests into test systems, how many test systems would turn out to be necessary to do competency assessment on? For example, in the area of immunohematology where we do a lot of tests: antibody ID, DATs, EGA, DTT, ficin treatment, elution, ReSt adsorption, warm auto or allo adsorption, etc. Grouping these tests into a test system, does each staff still have to do ALL of these individually?