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Hi Brian, Thanks for your very helpful and thoughtful response.
For the structural standards: For example, now we are doing load testing on the new latrine design with a 210 L drum of water sitting on top of a test latrine for several weeks to mimic user weight. We also did testing of local bricks with a compressive strength test showed only 33% passed, not a very good rate. Mostly looking for more ideas similar to these that we should try.
For the human dimensions: We have been running ongoing trainings for the masons and currently are doing a tracer study to see what is working and how we can expand the training program. I agree this is a very important variable but want to ensure the design is safe as a priority.
Thank you again, your response was very helpful and gave our team some good ideas.