I just wanted to point out a couple of possible improvements to the home profile survey:
1. Washing machine - the question asks how many hot washes you do per week and the minimum is two or less. Who on earth is washing in hot water these days? Unless you are washing overalls or soaking a doona (even then I only do the wash in hot water - not the rinse) why would you need hot water? So i think there should be an option that says 'rarely' or a few times a quarter.
2. Also maybe ask how many loads of washing people do - this might not equate neatly to the number of people in the house. It depends how manual their work is and if they play a lot of spot (lots of uniforms to wash) etc.
3. Dishwasher use - maybe ask this too - some people obsessively run their dishwashers every evening no matter what, because they don't want the contents to 'get stinky' - how the smell on the inside of a dishwasher hurts anyone has always been a mystery to me.
4. It might be good to produce a downloadable form that you could print off of all the different use types so people could keep their own record for a week of how much laundry, dryer use (not sure if you asked usage for this as I don't have one) dishwashing, showers etc, and then they could update their profile.