I acquired their first 2 books just before I got married. It gave me a plan to know just how often certain things needed to be done (like cleaning the oven, stove, etc.) Some things I just knew and others--well, I let Pam and Peggy help me.
Their book Sidetracked Sisters Catching up on the Kitchen expanded their system to collecting recipes and menus in one place as well as de-cluttering the heart of the home (the kitchen of course!)And they created a pre-printed grocery list.
I think anyone who is taking over the responsibility of maintaining a household could certainly use BOTH of these books.
My 3rd choice is by Jeff Campbell and the Clean Team which tells how to clean in half the time--but that's another story.