Considering this survey is part of a research masters thesis, I find it to be rather full of presumptions. His has base premises that really don't exist, such as multiple established commercial food forests within urban perimeters which allow residents to harvest food. While I know of some botanical gardens and preservation gardens that include food forests, they are for display and education only. Plus these gardens are not located in urban situations. I also feel there is a flaw in that there are no escape answers for sone question, such as "I don't know", "not applicable", etc.
From the questions in the survey,
should I conclude that cities in Germany have multiple established (thus named) food forests open for public at-will harvesting?
While the survey targets just urban food forests, it fails to account for non-urban ones. The failure to track urbanites who go outside the urban environment to visit food forests is a weakness in the research. Plus it fails to consider forest forests that are non-commercial, such as community gardens, non-profit gardens, open farms, PYO, etc.
I did not fill out the survey because there are zero public access, harvestable food forests in my entire state. But I regularly harvest food from forest situations, both natural and manmade. This survey fails to account for my state and I could not convey that information for his research paper.