When a biological product requires a specialized delivery device, the resulting combination product can introduce new types of quality evaluation. Product development brings together regulatory requirements for biologics and drug-delivery systems, and for many people on the biopharmaceutical side, that includes a number of unfamiliar terms, processes, and procedures. Among those are gauge repeatability and reproducibility studies for measuring variations that arise from measurement devices and the operators using them. This eBook introduces the concept of attribute-data gauge repeatability and…