# Ten flexible starts · Days21–30

Optional25-minute shape:0–3 invite/purpose;3–7 one model/encounter;7–18 own chosen action;18–22 inspect/reason;22–25 possible next move. Split/pause freely; no finishing/timing score. Use one of the three [specific routes](PARTICIPATION-ROUTES.md), the corresponding pair of [worked contexts](WORKED-CONTEXTS.md), and usual local access support. Original models are unperformed teacher sources. Actual device authorship/operator is attributed; paper/director routes retain reasoning with implementation open. E/F fresh first capture before feedback/key.

## Day 21 · Give the total a job

**Invite:** What should one total tell a pretend user?

**Encounter/model:** Moon-sticker tray: SET1, ADD2, SHOW gives3. ADD2 again gives5; SET2 instead replaces the total with2. This is an unperformed model, not real stock data.

**Own practical action:** Choose an invented collection/puzzle purpose and one check, such as “the start is included once”. Create your own SET and SHOW, run, then choose an ADD/change and predict. No complete model is entered for the child.

**Observe/check:** Ask what the start and total mean; inspect the actual chosen block and run if available.

**Possible misconception:** Thinking SET and ADD both mean putting another amount in. Compare before/after rather than demand a definition.

**Next teaching move:** Return to one SET/ADD contrast with their own values.

**Use:** choose one route, one model or neither where unnecessary. No30-route log or all-context quota. [Home/extra 1](HOME-AND-EXTRAS.md) is an independent free offer, not required catch-up.

## Day 22 · Choose between two designs

**Invite:** Which instruction keeps earlier contributions?

**Encounter/model:** Pretend snowflake badge: start0, add4 then2 gives6. Setting4 then2 gives2. Two designs may both be valid for different stories.

**Own practical action:** Generate two tiny designs for a chosen purpose; compare or dictate block order, select against a criterion, create/change the preferred programme and run. One meaningful alternative is enough before continuation.

**Observe/check:** Does the explanation tie the instruction difference to the user’s purpose and actual variable state?

**Possible misconception:** Saying “the longer programme is better” without checking the intended job.

**Next teaching move:** Offer a changed start/input that separates their two designs.

**Use:** choose one route, one model or neither where unnecessary. No30-route log or all-context quota. [Home/extra 2](HOME-AND-EXTRAS.md) is an independent free offer, not required catch-up.

## Day 23 · Let each record contribute

**Invite:** How will the same instructions process a new batch?

**Encounter/model:** Pretend telescope tokens: SET0; FOR EACH[ADD input]; SHOW on[1,2] gives3, and[1,5] gives6. The input source must be inside the loop.

**Own practical action:** Enter own fictional ordered records, make FOR EACH and choose ADD current input; predict, run and inspect each input’s contribution. Change one record and compare a new trace.

**Observe/check:** Point to one input and the total immediately before/after its ADD; who created and entered the block?

**Possible misconception:** Using a constant ADD while expecting it to read each record.

**Next teaching move:** Contrast ADD1 with ADD input for unequal records.

**Use:** choose one route, one model or neither where unnecessary. No30-route log or all-context quota. [Home/extra 3](HOME-AND-EXTRAS.md) is an independent free offer, not required catch-up.

## Day 24 · Keep the start once

**Invite:** Where should initialisation happen?

**Encounter/model:** Pretend lantern marks: SET2 outside a loop plus[1,3] gives6; SET2 inside before ADD input gives5. Empty batch with outside SET/SHOW leaves2; inside-only SET/SHOW leaves total unset and cannot complete.

**Own practical action:** Place an own SET once or in a body intentionally; explain which matches the story, run zero/one/several records as useful and change its position. Use remove/add or move within a body; there is no automatic cross-body move.

**Observe/check:** Does learner distinguish persistent total from reset on each record? Capture a useful state explanation or repair.

**Possible misconception:** Assuming the loop automatically keeps a running sum regardless of SET position.

**Next teaching move:** Trace one short unequal batch, retaining every before/after value.

**Use:** choose one route, one model or neither where unnecessary. No30-route log or all-context quota. [Home/extra 4](HOME-AND-EXTRAS.md) is an independent free offer, not required catch-up.

## Day 25 · Fresh E · a total repair

**Invite:** What first evidence is available before help?

**Encounter/model:** Only unrelated recall if needed: SET0, ADD5, SHOW means5. Do not model the held source or repair.

**Own practical action:** Offer [Fresh E](STUDENT-CHECKS.md). Capture own first prediction/design/change/reason; approved-device actual entry/run is recorded separately. One meaningful first component may precede another sitting.

**Observe/check:** Use separate descriptive key after first capture. No new hints/key during capture.

**Possible misconception:** A matching final number alone does not prove a general input-responsive repair.

**Next teaching move:** Give specific feedback after first capture, then a different changed batch if teaching is needed.

**Use:** choose one route, one model or neither where unnecessary. No30-route log or all-context quota. [Home/extra 5](HOME-AND-EXTRAS.md) is an independent free offer, not required catch-up.

## Day 26 · More than two useful outcomes

**Invite:** How can a record choose among three alternatives?

**Encounter/model:** Pretend kite badges: input<2 add0; otherwise input<5 add3; otherwise add5. From0 on[1,3,8] the totals are0,3,8. Threshold2 belongs to the middle and5 to the last.

**Own practical action:** Choose an own invented three-outcome rule; create IF inside FOR EACH with a nested IF in one body. Fill both bodies, predict one useful input per outcome, run/inspect and change a threshold.

**Observe/check:** Does the second decision happen only after the first fails? Does changed input alter actual branch/action?

**Possible misconception:** Treating nested alternatives as two independent IF tests and applying both awards.

**Next teaching move:** Draw or state one decision path, then compare its actual branch trace.

**Use:** choose one route, one model or neither where unnecessary. No30-route log or all-context quota. [Home/extra 6](HOME-AND-EXTRAS.md) is an independent free offer, not required catch-up.

## Day 27 · A boundary can find a bug

**Invite:** Which input separates two rules?

**Encounter/model:** Pretend prism tokens use input<4 ADD1 otherwise ADD3. Input4 chooses3; changing to≤4 chooses1. This comparison boundary matters even if most inputs agree.

**Own practical action:** Choose a meaningful comparison/update change; predict a separating record. Run both sides and the exact boundary, then repair whichever version misses the criterion. Inspect SET placement too if state differs.

**Observe/check:** Is the test selected to reveal a difference, rather than just rerunning a familiar output?

**Possible misconception:** Using only one convenient record and declaring every branch correct.

**Next teaching move:** Offer the closest exact boundary and an alternative outcome, with no speed requirement.

**Use:** choose one route, one model or neither where unnecessary. No30-route log or all-context quota. [Home/extra 7](HOME-AND-EXTRAS.md) is an independent free offer, not required catch-up.

## Day 28 · Explain an algorithm someone can follow

**Invite:** What must your representation preserve?

**Encounter/model:** Pretend comet tally: SET0, FOR EACH ADD2, SHOW on three invented inputs gives6 regardless of their values. A sketch that says ADD input changes the algorithm even if one batch happens to total6.

**Own practical action:** Communicate own ordered design as blocks, a nested diagram or exact spoken sequence. Compare an alternative against the same story; make one actual block change if chosen. Tell a willing reader what data a trace adds, if available.

**Observe/check:** Are initialisation, enclosing bodies, input source and alternative actions preserved? A verbal design remains design, not independent entry.

**Possible misconception:** Equating algorithms merely because one final total matches.

**Next teaching move:** Use a changed unequal batch that distinguishes constant from input.

**Use:** choose one route, one model or neither where unnecessary. No30-route log or all-context quota. [Home/extra 8](HOME-AND-EXTRAS.md) is an independent free offer, not required catch-up.

## Day 29 · Choose a useful revision

**Invite:** How well does the actual solution meet the story?

**Encounter/model:** Pretend puzzle counter criteria: include start once, process every fictional record, give visible feedback. A correct total with no SHOW fails the visible-feedback criterion. No real user testing is supplied.

**Own practical action:** Evaluate own actual available solution, including one access/resource trade-off or possible effect on a pretend community; choose a meaningful edit and rerun. Optional willing private reader response is kept separate from prediction.

**Observe/check:** Which evidence supports the judgement and which possible effect is still a proposal?

**Possible misconception:** Inventing reader feedback or assuming one helper establishes multiple-tool competence.

**Next teaching move:** Select one criterion they can actually test; leave broader impact open.

**Use:** choose one route, one model or neither where unnecessary. No30-route log or all-context quota. [Home/extra 9](HOME-AND-EXTRAS.md) is an independent free offer, not required catch-up.

## Day 30 · Fresh F · build your own rule

**Invite:** What does a new input change in your own design?

**Encounter/model:** No model of fresh F. Recall only blank tool access/support as needed.

**Own practical action:** Offer [Fresh F](STUDENT-CHECKS.md), capture untouched first design/component before feedback, then allow actual programme entry/run/changed-input inspection across sittings. Alternatives valid.

**Observe/check:** Use separate key for variable state, iteration and multiple outcomes; identify actual operator/help and first versus later work.

**Possible misconception:** Awarding programme implementation for a paper design or supplied ready-made programme.

**Next teaching move:** Choose the next teaching move from the available evidence, not whole-band grade.

**Use:** choose one route, one model or neither where unnecessary. No30-route log or all-context quota. [Home/extra 10](HOME-AND-EXTRAS.md) is an independent free offer, not required catch-up.