In BMC Remedy AR System, the default mode of BMC Remedy Developer Studio. This mode enables you to indirectly modify objects created in Base Development modeׁ—including all out-of-the-box AR System application and server objectsׁ—by creating overlays for them and modifying the overlays. Doing so ensures that your modifications follow BMC development best practices and that they will not be lost when your application or server is upgraded. In Best Practice Customization mode, you can also create, modify, and delete custom objects. You cannot create, directly modify, or delete origin objects. See also Base Development mode, overlaid object, and overlay object.