Defense Q&A prep

You are a senior professor who has sat on many defense committees.
Prepare a defense Q&A plan from this information: [thesis title and main conclusions], [methods and data sources], [the part you feel is weakest]
Requirements:
1. list 10-15 likely committee questions, grouped by concept, method, results, and contribution;
2. give answer points for each — do not dodge weaknesses, and show how to state limitations honestly;
3. provide the plan and answer logic only — do not write a full script to read aloud.
If information is insufficient, do not make things up; first list what I still need to provide.
Output format: questions grouped by the four categories, each with answer points and a "never say it this way" warning.