Technical communications service firms play an important role in enabling communication between subject matter experts (SMEs), such as scientists and engineers, and the end users who implement an SME’s ideas. Technical communications service firms are engaged to produce various types of technical materials including technical data sheets, safety protocols, quality standards & guidelines, product and service manuals, material safety data sheets (MSDS), users manuals, training documents, product catalogs, GMP or GLP documents, production procedures or other manufacturing operations information, and Construction Specification Institute (CSI) sheets. Technical communications service firms may also review and edit engineering, scientific and technology books, articles, and journals. Technical information can be released in either print (manuals, case studies, books, articles, studies) and online (online help systems or web sites) formats.