Assay development is a field of research focused on the design, optimization, and validation of methods used to measure the presence, concentration, or activity of a target molecule or biological process. This can include the development of new assays for detecting biomarkers, monitoring drug efficacy, or evaluating the impact of genetic mutations. Assay development often involves a combination of biochemical, molecular biology, and analytical techniques to create sensitive, specific, and reproducible assays that can be used in research, diagnostics, or drug development.