# Mechanism Classification Report

> **Part of the Overton Window Analysis.** See the [synthesis report](overton_window_synthesis.md) for the integrated narrative, or the [interactive article](overton_window.qmd) for the full story with charts.

**Sample:** 200 motions (stratified: 50 pre-2024, 150 post-2024)
**Classified:** 200 motions | **Unclassified:** 0

## 1. Mechanism Distribution by Group

### Pre-2024, High Centrist Support (CS > 0.5)

| Mechanism | Count | Pct |
|-----------|-------|-----|
| Consensus framing (gedeeld belang) | 6 | 24.0% |
| Institutioneel/rechtsstatelijk | 2 | 8.0% |
| Welzijn/dienstverlening uitbreiding | 3 | 12.0% |
| Procedureel/technisch | 11 | 44.0% |
| Lokaal/regionaal | 0 | 0.0% |
| Coalitie-afstemming | 0 | 0.0% |
| Symbolisch/declaratoir | 0 | 0.0% |
| Gerichte restrictie | 1 | 4.0% |
| Systeemontmanteling | 0 | 0.0% |
| Crisisrespons | 2 | 8.0% |
| **Total** | **25** | **100%** |

### Pre-2024, Low Centrist Support (CS <= 0.5)

| Mechanism | Count | Pct |
|-----------|-------|-----|
| Consensus framing (gedeeld belang) | 1 | 4.0% |
| Institutioneel/rechtsstatelijk | 0 | 0.0% |
| Welzijn/dienstverlening uitbreiding | 2 | 8.0% |
| Procedureel/technisch | 2 | 8.0% |
| Lokaal/regionaal | 2 | 8.0% |
| Coalitie-afstemming | 0 | 0.0% |
| Symbolisch/declaratoir | 3 | 12.0% |
| Gerichte restrictie | 6 | 24.0% |
| Systeemontmanteling | 4 | 16.0% |
| Crisisrespons | 5 | 20.0% |
| **Total** | **25** | **100%** |

### Post-2024, High Centrist Support (CS > 0.5)

| Mechanism | Count | Pct |
|-----------|-------|-----|
| Consensus framing (gedeeld belang) | 18 | 24.0% |
| Institutioneel/rechtsstatelijk | 7 | 9.3% |
| Welzijn/dienstverlening uitbreiding | 3 | 4.0% |
| Procedureel/technisch | 24 | 32.0% |
| Lokaal/regionaal | 3 | 4.0% |
| Coalitie-afstemming | 2 | 2.7% |
| Symbolisch/declaratoir | 4 | 5.3% |
| Gerichte restrictie | 13 | 17.3% |
| Systeemontmanteling | 0 | 0.0% |
| Crisisrespons | 1 | 1.3% |
| **Total** | **75** | **100%** |

### Post-2024, Low Centrist Support (CS <= 0.5)

| Mechanism | Count | Pct |
|-----------|-------|-----|
| Consensus framing (gedeeld belang) | 6 | 8.0% |
| Institutioneel/rechtsstatelijk | 19 | 25.3% |
| Welzijn/dienstverlening uitbreiding | 1 | 1.3% |
| Procedureel/technisch | 9 | 12.0% |
| Lokaal/regionaal | 1 | 1.3% |
| Coalitie-afstemming | 0 | 0.0% |
| Symbolisch/declaratoir | 5 | 6.7% |
| Gerichte restrictie | 21 | 28.0% |
| Systeemontmanteling | 13 | 17.3% |
| Crisisrespons | 0 | 0.0% |
| **Total** | **75** | **100%** |

## 2. Consolidated Pre vs Post-2024 Distribution

| Mechanism | Pre-2024 | Pct Pre | Post-2024 | Pct Post |
|-----------|----------|---------|-----------|----------|
| Consensus framing (gedeeld belang) | 7 | 14.0% | 24 | 16.0% |
| Institutioneel/rechtsstatelijk | 2 | 4.0% | 26 | 17.3% |
| Welzijn/dienstverlening uitbreiding | 5 | 10.0% | 4 | 2.7% |
| Procedureel/technisch | 13 | 26.0% | 33 | 22.0% |
| Lokaal/regionaal | 2 | 4.0% | 4 | 2.7% |
| Coalitie-afstemming | 0 | 0.0% | 2 | 1.3% |
| Symbolisch/declaratoir | 3 | 6.0% | 9 | 6.0% |
| Gerichte restrictie | 7 | 14.0% | 34 | 22.7% |
| Systeemontmanteling | 4 | 8.0% | 13 | 8.7% |
| Crisisrespons | 7 | 14.0% | 1 | 0.7% |
| **Total** | **50** | **100%** | **150** | **100%** |

## 3. Consensus Framing Hypothesis Test

**H0:** Consensus framing is equally common in high-support and low-support post-2024 motions.
**H1:** Consensus framing is significantly more common in high-support post-2024 motions.

- Consensus framing in post-2024 HIGH: 18/75 (24.0%)
- Consensus framing in post-2024 LOW: 6/75 (8.0%)
- χ²(1) = 6.002, p = 0.0143
- **Result: Significant difference (p < 0.05). Consensus framing IS more common in high-support post-2024 motions.**

- Consensus framing pre-2024: 7/50 (14.0%)
- Consensus framing post-2024: 24/150 (16.0%)

## 4. Chi-Squared Test: Period × Mechanism

- χ²(9) = 28.550, p = 0.0008
- Significant difference in mechanism distribution between pre and post-2024.

## 5. Chi-Squared Test: Support Level × Mechanism (Post-2024)

- χ²(9) = 38.350, p = 0.0000
- Significant difference in mechanism distribution between high and low support post-2024 motions.

## 6. Key Findings

### Top 3 mechanisms in post-2024 HIGH-support motions:
- Procedureel/technisch: 24 (32.0%)
- Consensus framing (gedeeld belang): 18 (24.0%)
- Gerichte restrictie: 13 (17.3%)

### Top 3 mechanisms in post-2024 LOW-support motions:
- Gerichte restrictie: 21 (28.0%)
- Institutioneel/rechtsstatelijk: 19 (25.3%)
- Systeemontmanteling: 13 (17.3%)

### Mechanism shifts from pre to post-2024

| Mechanism | Pre Pct | Post Pct | Δ |
|-----------|---------|----------|---|
| Consensus framing (gedeeld belang) | 14.0% | 16.0% | +2.0% |
| Institutioneel/rechtsstatelijk | 4.0% | 17.3% | +13.3% |
| Welzijn/dienstverlening uitbreiding | 10.0% | 2.7% | -7.3% |
| Procedureel/technisch | 26.0% | 22.0% | -4.0% |
| Lokaal/regionaal | 4.0% | 2.7% | -1.3% |
| Coalitie-afstemming | 0.0% | 1.3% | +1.3% |
| Symbolisch/declaratoir | 6.0% | 6.0% | +0.0% |
| Gerichte restrictie | 14.0% | 22.7% | +8.7% |
| Systeemontmanteling | 8.0% | 8.7% | +0.7% |
| Crisisrespons | 14.0% | 0.7% | -13.3% |

## 7. Conclusion

The consensus framing hypothesis **is supported**: consensus framing motions are 24.0% of high-support post-2024 motions vs 8.0% of low-support post-2024 motions (χ² = 6.002, p = 0.0143).

### Limitations
- Sample: 200 motions (50 pre, 150 post) — may not capture rare mechanisms
- Single-classifier: all motions classified by one subagent (inline), no inter-rater validation
- Binary support threshold: CS > 0.5 vs <= 0.5 may oversimplify the support spectrum
- Mechanism assignment: single primary mechanism per motion; some motions span multiple categories
