Phase 1: Prepare
Step 1 Warm-up recall
From M6.L2: where does a break fall in a block plan?
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Step 2 Learning goal
By the end of this lesson you can:
- count the cost of interruptions (Foundation);
- design a low-distraction setting (Core);
- say what the evidence cannot tell you (Core).
Phase 2: Teach
Step 3 A familiar example
Each time a notification pulls you away, you lose the seconds you spend on it plus the time to find your place again.
Step 4 Clear explanation
Working memory holds only a few items (Module 2). An interruption empties some of them, so you must rebuild your place. Rubinstein, Meyer and Evans (2001) showed that switching between tasks costs time and accuracy.
| Item (invented 90-minute session) | Minutes |
|---|---|
| Session length | 90 |
| Interruptions: 12 x 2 minutes each | 24 |
| Focused time left (90 − 24) | 66 |
In the invented session, 12 interruptions of 2 minutes each cost 24 minutes, leaving 90 − 24 = 66 minutes of focused work. The real cost differs, since getting back often takes longer than the interruption itself. Practical changes include putting the phone in another room or on silent, closing unneeded tabs, keeping one task visible and agreeing on quiet times with the people around you.
The setting also matters for recall: studying in the place you will be tested may help a little, but varying places can help too, so do not build a rule on it. It helps to have a regular place so that sitting down becomes a cue to work. Avoid assuming that background music helps or harms everyone; the evidence is mixed and depends on the task and on the person. Test your own set-up (Module 8). See the entry on working memory for why switching costs so much.
Step 5 Worked example (4 marks)
A 60-minute session has 9 interruptions costing 3 minutes each. How much focused time is left?
- Lost time: 9 x 3 = 27 minutes. (1 mark)
- Focused time: 60 − 27. (1 mark)
- = 33 minutes. (1 mark)
- Answer: 33 minutes. (1 mark)
Phase 3: Practise
Step 6 Learner practice (instant-marked)
1. Task switching usually:
Switching has a cost.
2. 12 interruptions at 2 minutes each cost:
12 x 2.
3. The best simple fix for phone distraction is to:
Remove the cue.
4. About background music, the evidence is:
It depends on the task and person.
Phase 4: Close
Step 7 Recap
- Interruptions cost the time spent and the time to return.
- Remove cues and agree quiet times.
- Test your own set-up rather than trust a rule.
Step 8 Exit ticket (ungraded)
8 interruptions at 2 minutes in a 50-minute session: focused time left?
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Step 9 Go further (Extension)
Count your own interruptions in one 30-minute session.
Common mistakes
| Mistake | Why it fails |
|---|---|
| Keeping the phone beside you | Move it away. |
| Counting only the interruption itself | Add time to return. |
| Trusting a one-size rule for music | Test yourself. |
Limits. The numbers are invented; research on environments and music is mixed, so use your own trial.