If I apply this question to submarine technologies, I believe the answer changes from what is already outlined. In this situation, security is important at all stages and influences how you do all stages. At any of these stages, foreign nations can compromise or gain sensitive information which would be catastrophic. Security would make it a lot harder to do any of these stages so one would have to understand that those stages are going to take longer and cost more than if security wasn’t a factor. In the initiation and planning stages, traceability is very important because if you don’t probably trace your parts you could end up with refurbished, faulty equipment. Its imperative that quality parts are used or the product would be compromised. In the initiation and planning phase, regulatory is another huge thing because these are lots of standards that have to be met and you have to start early on to ensure that you meet all of them. During the execution, closing, and monitoring/controlling phase, a quality system has a big impact to make sure the product is assembled correctly and even after its put into service, is still meeting standards.

I believe this answer changes depending on the project and the situation.