Thank you for your reply. I appreciate it, specially as I plan on sitting for the CSSLP as well in March of next year. I don't have the CSSLP book yet and I was hoping that would be the "tie-breaker".
It sounds like adding the CSSLP then by all accounts ISC2 has a total of 3 different lifecycles for software development, which is understandable in real world scenario, but should not be the case for a single topic in an educational setting (but then again, what do I know about education.). 🙂