In science a protocol is a predefined written procedural method in the design and implementation of experiments. Protocols are written whenever it is desirable to standardize a laboratory method to ensure successful replication of results by others in the same laboratory or by other laboratories.
PubMed - resource for finding recent protocols.
Cold Spring Harbor Protocols: full-text published by Cold Spring Harbor Laboratory Press.
includes Methods in Molecular Biology and Methods in Molecular Medicine. Covers: biochemistry, biotechnology, genetics, microbiology, molecular and cell biology, neuroscience, oncology, and proteomics.