  We examine two scenarios for formation of the planetary nebula K648: a prompt
scenario where the planetary nebula is ejected and formed immediately after a
helium shell flash and a delayed scenario where a third dredge up occurs and
the envelope is ejected during the following interpulse phase. We present
models of both scenarios and find that each can produce K648-like systems. We
suggest that the prompt scenario is more favorable but cannot rule out the
delayed scenario.
