Along with David Allen, I am a big believer in checklists. This is what Allen says:
Get comfortable with checklists, both ad hoc and more permanent. Be ready to create and eliminate them as required. Make sure you have an easily accessed place to put a new list that’s also attractive and even fun to engage with—in a loose-leaf notebook or in a software application that is readily available. Appropriately used, checklists can be a tremendous asset in enhancing personal productivity and relieving mental pressure.
Allen, David. Getting Things Done.
One of my top level books in Notebooks is Lists and Instructions
I have checklists for every multi-step procedure in my life, from departure and arrival instructions that I can send to guests to packing lists for every type of trip.