Generic effort estimation model for TYPO3 LTS major version upgrades. Captures what makes an upgrade hard (per-version breaking-change deltas, Rector coverage, ecosystem readiness); your team's historical data captures how fast you handle each unit.
Calibration is intentionally external. The model gives per-extension hour ranges; you supply the multiplier from your own projects.
When to Use
- TYPO3 upgrade estimation: "v13 → v14.3 LTS effort?"
- Extension compatibility: "Which extensions need updates for v14?"
- Skip-version vs incremental decisions
v14.3 LTS Headline
The largest breaking-change cycle in years — 98 breaking + 31 deprecation entries, all in v14.0. Sprint 14.0–14.2 are unsupported.
Most impactful v14 multipliers (full table in references/risk-multipliers.md):
| Factor | Multiplier |
|---|---|
TypoScriptFrontendController removal (#107831) |
× 1.3 |
| Fluid 5 strict VH typing (#108148) | × 1.2 |
| Core asset concat/compression removal (#108055) | × 1.2 |
| HashService removal, magic finders | × 1.1 each |
TCA sweep / EXT:form / ext_tables.php deprecation |
× 1.05–1.2 |
Rector: 47 v14 rules; discount × 0.80–0.85 vs hand-coded. Post-upgrade: +0.5–1 h for #109585 wizard if project transited through v14.2.
Baselines (before calibration)
| Path | Own ext (with Rector) | Stale third-party | Project ops |
|---|---|---|---|
| v13 → v14.3 | 4–8 h | +2–4 h | +0.5–1 h |
| v12 → v13.4 | 3–6 h | +2–3 h | +0.5 h |
| v11 → v12.4 | 4–7 h | +3–5 h | +1 h |
| v10 → v11.5 | 5–8 h | +4–6 h | +1 h |
Multiply by team calibration factor (typically 0.6–1.4).
7-Phase Assessment Workflow
- Discovery — versions, extension inventory, build tooling
- Classification — see
references/extension-classification.md - Compatibility matrix — see
references/version-compatibility.md - Custom code analysis — grep triggers, see
references/assessment-workflow.md - Risk calculation — compound multipliers from
references/risk-multipliers.md - Work estimation —
extension_hours = baseline × Π(multipliers) × rector_discount × calibration - Timeline — phased approach with validation gates
Companion Skills
typo3-conformance-skill— quality scoring (feeds risk multiplier)typo3-testing-skill— coverage assessmenttypo3-extension-upgrade-skill— performs the upgradetypo3-project-upgrade-skill— deployed-project upgrade
For Netresearch-internal calibration with historical project data, see coding-ai/typo3-upgrade-estimator-skill (consumes this model).
References
references/risk-multipliers.md— full per-version tablereferences/version-compatibility.md— TYPO3 ↔ PHP matrixreferences/extension-classification.md— categories and riskreferences/assessment-workflow.md— command-level workflowreferences/rector-coverage.md— Rector counts and discountsreferences/flux-to-content-blocks-migration.md— Flux/VHS → Content Blocks + b13/container (cost block for Flux-based projects)references/relaunch-vs-portation.md— relaunch vs. portation; estimate by work-packagereferences/upgrade-patterns.md— case study: georgringer/news v11→v12 upgrade patterns