I'm with TreePeople's T.R.E.E.S. Project, the long-term goal of which is to move Los Angeles out of the cellar in rankings of sustainability. We're focused right now on implementing a management plan in a subwatershed of the L.A. River. Success will depend in part on the active participation of 20-40% of the area's individual property owners, both residential and commercial. We hope to find in your research some hints on how to reach that level of participation.