When choosing a CRO, CDMO, or CMO, ensure compliance with key regulations. In the U.S., this includes FDA regulations such as 21 CFR Parts 11, 58, 210-211, 312, and 820 for electronic records, GLP, CGMP, and investigational drugs. The European Union mandates compliance with EudraLex Volume 4 (EU GMP), Directive 2001/83/EC, and Regulation (EU) No 536/2014 for clinical trials. Internationally, ensure adherence to ICH GCP for clinical practices and WHO GMP standards. For data handling, check compliance with GDPR (EU) and HIPAA (U.S.). For biologics, FDA 21 CFR Part 600 and EMA ATMP Regulation (1394/2007) are crucial.