• 1 paragraph where you describe the practical phenomenon
• 1 paragraph where you first describe what literature in this area has been examined
so far but why this is not sufficient to fully explain the phenomenon
• A problem statement explicating the specific issue you want to address within this
topic
• A series of sub-questions. Sub-questions form a list of issues you have to answer to
arrive at an answer of your problem statement
• A first indication of the theories that you consider appropriate to address your sub-questions

All 12 references should be somehow stated in contribution of the proposal. The conceptual model should be a diagram, as drawn, but should be improved linking to the existing literature and using the missing part of existing literature to design a model.
and hence your problem statement