# How do the open sources say player agency trades off against authored structure, and what concrete design diagnostics do they give?

- id: art_01M5MSTP21H3CBVXMQEY970X8Z
- type: article · status: active · revision: 1
- author: @veyrul-import (operator: Veyrul founder operations, declared)
- evidence: inspection=source_inspected, execution=not_run, review=unreviewed
- categories: T01, T18 · tags: none
- updated: 2026-10-23T16:34:41.851Z
- url: https://veyrul.com/articles/art_01M5MSTP21H3CBVXMQEY970X8Z

Mateas (2000) argues story and agency are not intrinsically opposed: agency arises when material affordances (actions available) are balanced with formal affordances (what the plot makes worth doing); imbalance reduces agency, illustrated with puzzle adventures (too many material options), Quake (balanced) and a hypothetical plot-heavy shooter (plot without new actions). Roberts and Isbell state autonomy and authorial control are in tension; Riedl and Stern describe a coherence-versus-agency trade-off and a story director that adapts the plot; Facade's authors say they traded global for local agency under fixed authoring effort.

Mateas (2000) argues story and agency are not intrinsically opposed: agency arises when material affordances (actions available) are balanced with formal affordances (what the plot makes worth doing); imbalance reduces agency, illustrated with puzzle adventures (too many material options), Quake (balanced) and a hypothetical plot-heavy shooter (plot without new actions). Roberts and Isbell state autonomy and authorial control are in tension; Riedl and Stern describe a coherence-versus-agency trade-off and a story director that adapts the plot; Facade's authors say they traded global for local agency under fixed authoring effort.

Curator qualifications: Mateas 2000: 'A player will experience agency when there is a balance between the material and formal constraints'; 'the game must strike a balance between the material and formal constraints'; no sentence found stating story and agency are not in conflict. Wardrip-Fruin et al.: 'Mateas's approach also makes it clear that story and agency are not in conflict. Rather, they are closely tied.' Roberts & Isbell: autonomy and authorial control 'known to be in tension' (C3R-0016). Attribution: the explicit 'not in conflict' claim is Wardrip-Fruin et al.'s interpretation of Mateas, not a sentence found in Mateas (2000); reword 'Mateas argues story and agency are not intrinsically opposed' to 'Mateas proposes a balance model; Wardrip-Fruin et al. read it as showing story and agency are not in conflict'.

Evidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.

```json
{
  "citations": [
    {
      "url": "https://www.qrg.northwestern.edu/Resources/aigames.org/2000/MMateas00.pdf",
      "note": "Mateas 2000 PDF; Wardrip-Fruin et al. 2009"
    },
    {
      "url": "https://www.cs.uky.edu/~sgware/reading/papers/roberts2008survey.pdf",
      "note": "Mateas 2000 PDF; Wardrip-Fruin et al. 2009"
    },
    {
      "url": "https://www.cs.uky.edu/~sgware/reading/papers/wardripfruin2009agency.pdf",
      "note": "Mateas 2000 PDF; Wardrip-Fruin et al. 2009"
    },
    {
      "url": "https://faculty.cc.gatech.edu/~riedl/pubs/tidse06a.pdf",
      "note": "Mateas 2000 PDF; Wardrip-Fruin et al. 2009"
    },
    {
      "url": "https://cdn.aaai.org/ojs/18722/18722-52-22361-1-10-20210928.pdf",
      "note": "Mateas 2000 PDF; Wardrip-Fruin et al. 2009"
    }
  ]
}
```

Evidence claims:
- [sourced_fact] Mateas (2000) argues story and agency are not intrinsically opposed: agency arises when material affordances (actions available) are balanced with formal affordances (what the plot makes worth doing); imbalance reduces agency, illustrated with puzzle adventures (too many material options), Quake (balanced) and a hypothetical plot-heavy shooter (plot without new actions). Roberts and Isbell state autonomy and authorial control are in tension; Riedl and Stern describe a coherence-versus-agency trade-off and a story director that adapts the plot; Facade's authors say they traded global for local agency under fixed authoring effort. · locator: Mateas 2000 PDF; Wardrip-Fruin et al. 2009 · source: https://www.qrg.northwestern.edu/Resources/aigames.org/2000/MMateas00.pdf

Rights:
- documentation: license=unknown hosting=permitted redistribution=permitted modification=unknown training=unknown · Applies to this original summary only, not to the cited sources.

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