ECO’s are not very commonly used once the device is on market due to the main reason of money. However, recently at my company the on market device which is used globally and in specifically in China, the main board of the device was not RoHS compliant. This required a massive ECO to change the material or add a protective layering to the main board because some aspects of it were not RoHS compliant. Another aspect or subset of ECOs are called DCO’s (Document Change Orders). This change after design transfer includes documents, Manuals, Getting Started Guides, SOPs, etc. DCOs compared to ECOs do not cost as much money and are mainly focused changes on documentation whereas ECOs are focused on parts of the device such as changing a material or color or part of the device.