In response to an earlier (much earlier!) comment regarding normal checklist responses, it was suggested that some c/l responses are "as required", meaning the specific response was variable, depending on the situation.
That's fine, though I haven't seen one in a checklist for quite some time.....my response to that response is that you never actually responded with "as required", you ALWAYS responded with the specific setting that was relevant at that time.
i.e. Engine Anti-Ice.....As required //was always responded to with On or Off!
In the back section of the QRH (for Boeings) there is a section that clearly lays out the only acceptable way to run any of the checklists within, be they Normal or Non-Normal.