 Subunit 3.9, Unit Summary. So let's recap the information covered in this unit. A project is divided into distinct lifecycle phases separated by programmatic key decision points where you're going to have some stakeholders come in and assess whether the project should be allowed to move forward. It's mature enough to the next part of the lifecycle. We also learned that the system baseline isn't agreed to set of requirements in the beginning. Later there'll be designs and drawings, and all of these things are configuration controlled and established so that along the way the team has a common understanding of all the products and all the requirements, designs that they need to be working from. Lastly, we learned that there are a series of technical reviews that are spread out throughout the lifecycle and they're used to monitor the development and the progress you're making along the way. And they're chaired by an independent review team of technical experts that will do an assessment and provide that assessment to the stakeholders regarding the progress that's been made. Congratulations! You made it to the end of Unit 3. Answer the last discussion question in the forums, after which you can move on to the Unit 3 quiz. Remember that this will count for 10% of your final grades, so study hard and good luck. Once you've completed the quiz, you can continue your research for the Mars Sample Return Mission Project.