Internal & external audits: first-, second-, and third-party audits. 1  A first-party audit is performed within an organization to measure its strengths and weaknesses against its own procedures or methods and/or against external standards adopted by (voluntary) or imposed on (mandatory) the organization.
Precursor (chemistry) In chemistry, a precursor is a compound that participates in a chemical reaction that produces another compound. In biochemistry, the term precursor often refers more specifically to a chemical compound preceding another in a metabolic pathway, such as a protein precursor. 1 Illicit drug precursors.
Definition of prologue. 1 : the preface or introduction to a literary work. 2a : a speech often in verse addressed to the audience by an actor at the beginning of a playb : the actor speaking such a prologue. 3 : an introductory or preceding event or development.