I am trying to assess the effectiveness of a health communication intervention implemented in a number of communities. No baseline data was collected prior to the implementation (I was not on the team at baseline). We have however come to the end of the implementation and needs to know if the intervention was effective. There are also comparable communities where no intervention was implemented(could serve as control).
My challenge is trying to identify the right study design for this assessment since no baseline data was conducted and no randomisation completed before the implementation. What study design would be appropriate for this study?