The term 'Development Stage' refers to the various stages of development that a project or product goes through before it is completed. The five-letter word 'PHASE' is often used to describe each stage of development, which can include planning, designing, testing, and launching. Each PHASE of development has its own set of tasks and goals that must be completed in order for the project or product to move forward. By understanding the different phases of development, project managers can better plan and manage their projects.