I developed an Urban Habitat Quality Index to help identify a threshold between functional resilient communities and those that have not yet achieved the biodiversity and inter- and intra-species relationships to be functional. The index was developed while I was on a sabbatical in Oxford, UK, and was in part inspired by an article on ecological memory by Sun et al. for which I was a co-author. It involves 15 parameters, each rated on a Likert scale of 0-5. I presented the work at a conference of the Society for Ecological Restoration, Western Chapter, in 2018 and in the article here on the academia.edu website I am describing the research and results on which that presentation was based.