Progress in functional proteomics has been limited for a long time, partially caused by limitations in assay sensitivity and sample capacity; however, protein microarrays have the ability to overcome these limitations so that a highly parallel analysis of hundreds of proteins in thousands of samples is attainable. In , expert researchers in the field present an up-to-date collection of robust strategies in the field of protein microarrays and summarize recent advantages in the field of printing technologies, the development of suitable surface materials, as well as detection and quantification technologies. Written in the highly successful series format, chapters include introductions to their respective topics, lists of the necessary materials and reagents, step-by-step, readily reproducible laboratory protocols, and key notes on troubleshooting and avoiding known pitfalls.