The elaboration of peptide libraries prepared by either chemical or bi
ological methods in a format useful for discovery of peptides with spe
cific biological activities was first introduced in the 1980s. A virtu
al explosion of activity in this area has occurred recently, and the b
asic approaches have been applied to a wide variety of chemistries and
for all manner of biological, chemical and physical targets. Recent a
dvances include new synthetic methodologies, new analytical methods, n
ew design methods and new assay procedures.