Deployment is the process of putting the finished application in the users' hands and basking in their adulation. This chapter describes the deployment phase of a software engineering project. It explains deployment scope and lists some of the things you should consider in a deployment plan. Often the action that determines the point of no return is moving users to the new system. You can set up networks, install new printers, and spray your company logo on new computers, but until people are using the new application, it's relatively easy to go back. Cutover is the process of moving users to the new application. The chapter describes four ways you can make life easier for all concerned: staged deployment, gradual cutover, incremental deployment, and parallel testing. It also lists some of the things you might need to deal with for a large deployment.