ECN<p>Engineering Change Notice: An Engineering Change Notice (ECN) is a document authorizing and recording design changes throughout the prototyping and life cycle phases of a product. ECN documentation contains the justification for changes made to a component or system once the initial design is complete.</p> <p>See also: <a href="http://www2.mae.ufl.edu/designlab/Lab%20Assignments/EML2322L-Engineering%20Change%20Notice.pdf">ECN</a></p>