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.