Thanks, both of those make sense! In United Marine International LLC File: B-281512 Date: February 22, 1999, the GAO states "The optional clause (52.212-2), which is to be used when FAR part 15 type procedures may be contemplated, that is "when the use of evaluation factors is appropriate", FAR 12.301( c ) was not included or incorporated.
Is this saying that you should only use the clause if you're planning to use FAR Part 15? For example, if you're using LPTA as described in FAR 15.101-2, then you should include 52.212-2?