Personal & Life
Case and Group Interview Drill: Reach a Conclusion in 30 Minutes
Intermediate | 1 whiteboard page · Task board: 5 columns (5 parent tasks, 10 subtasks)
Intermediate: Method names appear, but the whiteboard explains the key points. Use the examples as a guide and fill it in, thinking it through for your own situation.
A drill board for group discussions and case interviews, opened a couple of weeks before the first session at a selection stage that has to reach a conclusion in thirty minutes. The whiteboard holds the target for those thirty minutes, a five-step run from framing to the closing move, a mind map of the five recurring topic types, a log table per practice round, and frames for ground rules, marks lost, and lessons. Five task columns run from Discussion topics to Used for real - pull only the next topic into Preparing, move it to Reviewed the same day, and send it on once it has worked for real.
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Case & Group Discussion Drill
How to use: (1) Read the 30-minute flow, then book a slot and pick roles → (2) Move one topic card at a time and always park it in Reviewed after the drill
1. Where You Land at 30 Minutes (read before you drill)
- The finish line One sentence of conclusion plus two reasons behind it. The figures need not be exact, but you must be able to explain how you got them.
- Rotate the roles Nobody keeps the same seat. Chair, note-taker and presenter rotate so everyone practices all three. Say today's roles out loud before you start.
- Always run a clock A drill without a timer does not count as a round. Move into wrap-up with five minutes left and log only the conclusions that landed in time.
- Where drills fall apart Arguing before you agree what the words mean burns the clock. Spend the first three minutes settling definitions and scope together.
2. How the 30 Minutes Run (framing to next move)
- Align Agree what the words mean and what a finished answer has to include.
- Break down Split the question into three or four sub-questions and order them.
- Hypothesis Put the likely answer up first, then say what must be true for it.
- Test numbers Break it into a formula, and flag any thin figure as an assumption.
- Conclude With five minutes left, give one conclusion and who does what next.
3. Five Topic Types That Keep Coming Up (pick one before you drill)
- Case types
- Sizing Users x uses x price
- Grow sales Buyers, price or repeat
- New market Why you win, when to exit
- Fix ops Start where rework is
- Cut costs Split fixed and variable
4. Practice Log (fill one row per round)
| Topic | Your role | What worked | What to fix | |
|---|---|---|---|---|
| Round 1 | Ex: local cafe demand | Note-taker, kept the board | Set assumptions up front | No conclusion in time |
| Round 2 | Ex: grow sales in a year | Chair, watched the clock | Picked up dissent, sorted it | Talked too long, overran |
| Round 3 | Ex: enter a new region | Presenter, one-minute close | Showed one number as proof | Never set the exit condition |
| Round 4 | Ex: cut steps in store work | Listener, mapped the issues | Broke a silence with a question | Left priorities vague |
5. Ground Rules for the Discussion
- Agree the wording in the first 3 minutes
- Build on someone's point before adding yours
- Contribution is progress made, not airtime
6. What Costs You Marks
- Talking over people and holding the floor
- Letting the topic widen with no eye on the clock
- Ending on impressions with no conclusion
7. One Line of Learning Each Time
- Write down the one move that worked
- Choose exactly one thing to fix next time
- Mark the patterns that worked in a real session
Task board contents
Discussion topics 15 items
Set up the drill
Decide this a couple of weeks before the first session. You are done when you can write out how the thirty minutes are split.
Plan the 30 minutes
Give framing, breakdown, testing and closing their own slice of time, and write your numbers onto the flow on the board.
Find practice peers
Line up three to five people and fix the dates. When nobody is free, switch to a solo run you record instead.
Prepare topics
Finish this before drilling starts. Collect business and workplace topics only, and leave social or political ones out.
List ten topics
Write two topics for each of the five types — sizing, growing sales, entering a market, fixing a process, and cutting costs.
Sort topics by type
Drop every topic you collected into the five types on the board and spot which type you have barely practiced.
Run timed drills
Aim for two rounds a week. Always run a clock, and only count a round where you reached a conclusion inside the time.
Always use a timer
Put the timer where everyone can see it, and call the move into wrap-up when five minutes are left.
Record and replay
Record the discussion and replay it asking one question only — did what you said move the discussion forward?
Write the review
Do this in the fifteen minutes right after the drill. Fill one row of the log and put both wins and fixes into words.
Name three wins
Pick three good moves, yours or someone else's, and add one line each on why they moved the discussion on.
Pick one fix
Choose the single thing you will fix next time and write it on the card for the next topic you drill.
Final tune-up
Finish the day before the session. Refit the format to the time you were given and run the opening minutes end to end.
Fit the time limit
Redraw each stage against the length you were told the discussion will run, and rewrite the numbers on the flow.
Drill the opening
Practice framing and breakdown alone a few times so you know what goes on the board in the first five minutes.
