First part of the presentation from the OECD Industry Event, ‘Multilateral symposium between Monitoring Authorities, Regulatory Authorities and Test Facilities on the Implementation of the OECD Principles of GLP’ held on 10 and 11 April 2008 - Critical Aspects in Implementing the OECD Monograph 14 'The Application of the Principles of GLP to In-vitro Studies.'