Take high definition photos of the entire yard, working out the leaf coverage ratios. Then take 17 leaf depth guages in randomly assigned points. Put up a camera taking still photos every 10 seconds to determine the probability of leaf fall per tree. Next use the climate patterns of the last 10 years, allied with the deciduousness per degree of temperature change to work out the probability of ratio change. Now, by retroactively assigning values, repeating the process in a wild deciduous forest as control, we can work out whether the effort to rake or not to rake would be worthwhile expenditure of time and energy.
How do I minimise the amount of dishes I need to do?