Similar to aij5, I have had quite a bit of experience working on ECO’s (my company calls them CCFs (Change Control Form)) for a product that my company acquired and it was already on the market. Unfortunately, it was a very cumbersome process, because in reality we were doing an NPD project under the realm of ECOs. We were creating new prints, and redefining all the specifications and tolerances, changing suppliers and going through process development with our suppliers, and it became very difficult to work within the constraints of the ECO process, but we had no choice since the product was already on the market.