Elizabeth Dallison is a Principal Scientist in the Analytical group supporting clinical supply testing at Pfizer, Ltd. She has more than 20 years of experience in the field of Cleaning Validation (CV). Elizabeth is an analytical chemist with extensive experience of the GMP environment with regard to Investigational Medicinal Products. This includes analytical method validation, residue limit setting, documentation and facility cleaning validation strategy as well as residue testing analytical support for CV. Elizabeth earned her B.Sc. with Honors in Analytical Sciences from the University of Greenwich and has worked previously for Smithkline Beecham.