The Certification Authorities Software Team (CAST) is an international group of certification and regulatory authority representatives from North and South America, Europe, and Asia. The team promotes harmonization of certification and regulatory positions on software and airborne electronic hardware aspects of certification.

The CAST provide their findings in the form of position papers with recommendations. CAST position papers are coordinated among international authority representatives. However, unless adopted by an authority having jurisdiction over matters to which the recommendations relate, these documents do not constitute official policy or guidance. CAST position papers are for education and information purposes only, and should be discussed with the appropriate certification authority when considering use for actual projects.