[vahid-ahmadi]

Corrects the PIP point system planning page (docs/book/programs/gov/dwp/pip-points-plan.md), written for #1069.

The page itself is already on main: it shipped in #2386 (merged 21 October 2026), and its original .added changelog entry was released in 2.143.0. This branch has merged main, dropped the released fragment and now carries only corrections to main's copy of the page.

What this PR corrects (from its changelog fragment):

Brought the PIP point system planning page (docs/book/programs/gov/dwp/pip-points-plan.md) up to date: #1661 merged on 21 October 2026, so total points and the 8- and 12-point thresholds are modelled, with no data path supplying points yet; Microcosm #145 closed without the points item; Microcosm UK is now the certified default; and the descriptor-weighting source is DWP's Pathways to Work evidence pack (Tables 2.27 and 2.28).

The claim-by-claim review behind these corrections, with sources, is in the "Ready for hub review" comment on this PR.

• Changelog fragment: changelog.d/1069-pip-points-page-corrections.changed.md (changed).
• Docs and changelog only; no code changes.

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[MaxGhenis]

UK hub (Claude build session, for Max)
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Head: 5f515b87fdf0402f51db684844b1318db329ae44

Context. A later version of this page reached main through #2386 (merged 21 October 2026), and the 1069-pip-points-plan.added.md entry is already in CHANGELOG.md under 2.143.0. This branch still had the 12 October version. I merged origin/main into this branch (no rebase, no force-push), resolved the add/add conflict to main's version, deleted the released .added fragment, and corrected main's version. The PR's net diff against main is now just those corrections plus changelog.d/1069-pip-points-page-corrections.changed.md. Suggested title: "Bring the PIP point system plan up to date".

Is the plan still worth having? Yes. #1661 merged on 21 October 2026 and implements total points and the thresholds. The page now says "partly modelled" and keeps the per-activity scores, descriptor parameters and data imputation as planned work.

Review. I had a verifier extract and check every claim, checked each correction myself, and then ran independent adversarial reviews (household runs on main). Round 1 asked for changes, and round 2 approved; its two optional wording points are applied in the last commit.

Corrected (13)

What #1661 changed

1. Add PIP points-based assessment scaffold (#1069) #1661 merged on 21 October 2026 (merge commit 1c42168). The title, warning box and status box now say total points (pip_dl_points, pip_m_points) and the 8- and 12-point thresholds (gov.dwp.pip.{daily_living,mobility}.points_thresholds) are modelled.
2. The category rule, stated exactly (policyengine_uk/utils/pip.py:18-72):
   • a category input for a year is stored for everyone, with NONE for others;
   • otherwise the latest assessed points (not -1) up to that year set it;
   • an earlier category carries forward unless the points are later than it.
3. No data path supplies points, so points play no part in microsimulation. Microcosm's disability stage outputs categories only.
4. microcosm#145 closed on 16 October 2026 with the PIP points item dropped (its closing comment).
5. Threshold reforms now work for households entered with points, but not in microsimulation.
6. Phase 1's threshold parameters are done (in Add PIP points-based assessment scaffold (#1069) #1661).
7. The "Existing model" list now includes the points inputs and thresholds.
8. Add PIP points-based assessment scaffold (#1069) #1661's points inputs default to -1, meaning "not assessed" (variables/input/pip_dl_points.py:10).

Data and sources
9. Microcosm UK has been the certified default since policyengine.py 6.10.0 (21 October 2026); it is not "being built to replace" the Enhanced FRS.
10. SI 2013/377 Sch. 1 Part 2 activity 8 is "reading and understanding signs, symbols and words".
11. No DWP table is called "activities most commonly scoring above zero". The per-activity score distributions are Tables 2.27 and 2.28 of the Pathways to Work evidence pack, chapter 2: working-age, normal-rules daily living awards in England, Wales and abroad, January 2025 caseload, with no per-activity mobility table.
12. DWP's regular statistics report award levels; the per-activity figures are one-off. Phase 3 now draws combinations within the observed band.
13. Replaced the released .added fragment with a .changed fragment.

Checked and correct (unchanged)

• pip_dl_category and pip_m_category are STANDARD | ENHANCED | NONE.
• pip_dl and pip_m use the weekly rate × 52; a household run gives 3,988.40 at the standard rate.
• Ten daily-living and two mobility activities, worth 0-12 points; standard at 8 and enhanced at 12 (regs 5(3), 6(3)), scored independently.
• Both datasets derive bands from reported amounts.
• uk-data#408 closed unmerged on 19 June 2026.
• The April 2024 green paper consulted on descriptors; the March 2025 Pathways to Work paper proposed the four-point rule, which was withdrawn in July 2025 (Hansard, 1 and 9 July 2025).
• PIP point system #1069 is open, and all links return 200.