| When | Change | Evidence | Session |
|---|---|---|---|
| 2026-10-20 | Secure → Secure | 20 Oct, cold, non-calc, typed: -3(x-4) = -3x + 12 first time, both terms multiplied, minus times minus right; 1/1 unaided. | session 120 |
| 2026-10-16 | Secure → Secure | 16 Oct, non-calc, typed: 3(x+5), 5(x-2) with the hint 'both terms' 2/2; then 4(x-1), 7(2x+3), -2(x+6) alone 3/3 (last typed -2x + -12, tidied). Both terms multiplied unprompted on all three, including the 14 Oct item 4(x-1) which had been 4x-1 under time. Then 4(x-1) less than 8 expanded right unaided inside an inequality. | session 111 |
| 2026-09-18 | Secure → Secure | 18 Sep starter, non-calc, timed: 3(2x−5) − 4(x−3) → 6x−15−4x+12 → 2x−3, all four terms written, −4×−3 = +12 correct. Fifth clean minus-bracket expansion (7, 9, 12, 15, 18 Sep), this one under a visible 10-minute timer. | session 31 |
| 2026-09-15 | Secure → Secure | audit: bar met in session 24 — 2(3x+1)−5(x−4) = x + 22, all four terms written, sign after minus bracket correct; fourth clean expansion in eight days, confirmed secure. | standalone |
| 2026-09-15 | Secure → Secure | 15 Sep starter, non-calc: 2(3x+1) − 5(x−4) → 6x + 2 − 5x + 20 → x + 22, all four terms written, −5 × −4 = +20 correct. Fourth clean minus-bracket expansion (7, 9, 12, 15 Sep). Minor: wrote 1x. | session 24 |
| 2026-09-10 | Secure → Secure | 9 Sep starter: 4(2x+3) − 3(x−5) → 5x + 27, negative-times-negative correct. Second clean independent expansion in three sittings. | session 17 |
| 2026-09-07 | Developing → Secure | 7 Sep starter: 5(3x−2) − 4(2x−3) → 7x + 2, all four terms written out unprompted including −4 × −3 = +12. Independent retest with working shown, exactly the bar set when it was demoted on 2 Sep. | session 7 |
| 2026-09-07 | Developing → Developing | 4 Sep starter: 6x²+8x left BLANK. Produced 2x(3x+4) correctly once walked through in three steps, so this is a starting failure, not a method failure. Stays developing. | session 6 |
| 2026-09-03 | Secure → Developing | CORRECTION — demotion. 2 Sep starter: 3(2x−5) − 2(x+4) given as 4x−7; the sign on −2 × (+4) was wrong and only corrected to 4x−23 after being prompted to expand all four terms separately. Third wobble on the same sub-skill since going secure on 13 Aug: re-scaffolding needed 16 Aug, collecting-terms slip on the 19 Aug exit check, sign error now. Demoted per the starter-failure rule. | session 3 |
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