measure group specification Called 'assay measurement' in BARD. For HCS measurement, we need to define 'assay measurement' as the outcome of image analysis and is most often a calculated value. This is similar to 'parameters', such as 'intensity', 'count', 'morphology', etc which are all dependent on phenotype, e.g., intensity and count (number of bright spots) are a result of the amount of gene expression, and morphology is dependent on morphological phenotype, which is detected by the expression of a marker. An abstract concept to group one or more assay readout and allow description of an assay that measures one or more effect of a perturbagen on the biological entity. This does not define the physical readout method itself, which is captured in assay design, but rather classifies the data being generated by those readouts. assay bioassay component