Definition
選擇效能：衡量在單位努力和注意力下，選擇與需求匹配程度的指標。
Theoretical basis
源自 T4 選擇效能定理：/zh-tw/wiki/theorem-4-selection-efficacy/
A practical formula (zh-aligned)
選擇效能 = 適合度 × 決策品質 / 認知成本
Components
| Component | Meaning | Key drivers |
|---|---|---|
| fit | match to stable needs | clarity of needs, evidence quality |
| decision quality | completeness and bias-resistance of process | methods, checklists, immunity |
| cognitive cost | time/effort/emotional load | complexity, info availability |
Core insight
完美會降低效能：如果認知成本暴增，即使產品稍微「更好」，整體效能也會下降。（參見 T4.1。）[^1]
Practical applications
- 高風險決策：投入更多認知預算以符合適合度。
- 低風險決策：使用啟發法以降低成本。
- 定義「夠好」的門檻以停止搜尋。
References
- Payne, J. W., Bettman, J. R., & Johnson, E. J. (1993). The Adaptive Decision Maker. Cambridge University Press.[source]
- Keeney, R. L., & Raiffa, H. (1993). Decisions with Multiple Objectives: Preferences and Value Tradeoffs. Cambridge University Press.[source]