1. Confirm the work, then the people. Before names go into shifts, write down what each time window must achieve. A retail team might need opening cash-up, customer cover, stock processing, and close-down. A care team might need medication rounds, personal care, mealtime cover, documentation, and overnight response. A sports club might need a coach, assistant coach, first aider, referee contact, kit lead, and registration volunteer. A single headcount target is not enough when the work needs different skills.
2. Check the minimum role mix. A shift can be fully staffed and still unsafe or unworkable if the wrong mix of people is present. Minimum role mix should show which skills are mandatory, which are preferred, and which can be covered remotely or by an on-call person. This makes the difference between "three people booked" and "the shift can actually run".
3. Check time overlap. Many gaps happen at the edge of shifts. Opening, close-down, handover, school-run periods, match arrival windows, and late deliveries often need overlap. If the roster only checks whole-shift headcount, it can miss the 30 minutes where everyone is changing over and nobody owns the floor.
4. Check whether the plan is resilient. Ask what happens if one person is late, sick, or pulled into an urgent task. If there is no backup path, the roster is brittle even when every cell is filled. A strong plan shows the first backup, the escalation route, and the manager who can approve a change.