However, we must admit that there a

However, we must admit that there are some weaknesses in this PAR project. It is not easy to conduct this project in housing estates for a long time because it is difficult to obtain the consent and support of the property management companies. Many housing estates had their own concerns and were reluctant to participate in the study. In this regard, we had to choose the housings that were willing to. In addition, the demographic structure of the residential housing estates was stratified in terms of age, household income and educational attainment, which made it difficult to motivate all the residents to participate in the project. Moreover, some ideas generated from the workshops were not able to be tested due to some practical limitations. For instance, food waste recycling was unavailable due to property management’s concerns. Only four images were replaced in actual practice. Many paths have not been travelled due to the constraints of practicality.