Get feedback from two other teams in your class by explaining each concept and getting feedback on each of the following criteria.
Do they understand the concept?
Do they see the value of the proposed investigation?
How much do they seem interested in the topic?
What other feedback or ideas did you get?
Then, outside of class, ask for 3 people's feedback on each concept using the same criteria. So a team of 3 should get a total of 9 (at least) individuals' feedback outside of class. Try to get quality feedback from each of your target stakeholders. Coordinate with your team who will target each key group.
You can use this template.
❏ Deliverable: Document containing all evaluation results.