flowchart TB
Def["Experiment Definition
Chapter 3 Worked Examples Test"]:::center
Hyp["Hypothesis
Worked examples raise mastery on Ch. 3 concepts"]:::part
Metric["Primary Outcome Metric
Chapter 3 concept mastery"]:::part
Unit["Unit Of Randomization
student_key"]:::part
Control["Variant — Control
v2.3, weight 50%"]:::control
Treatment["Variant — Treatment
v2.4 worked examples, weight 50%"]:::treatment
Guard["Guardrail Metric
Engagement must not drop more than 5%"]:::part
Elig["Eligibility Predicate
Districts that have not opted out"]:::part
Def --> Hyp
Def --> Metric
Def --> Unit
Def --> Control
Def --> Treatment
Def --> Guard
Def --> Elig
classDef center fill:#2a9d8f,stroke:#1f7a6f,color:#fff,font-size:13px
classDef part fill:#8fd3c9,stroke:#3bab9d,color:#0c2f2b,font-size:12px
classDef control fill:#8b9bb0,stroke:#5f6e82,color:#fff,font-size:12px
classDef treatment fill:#e9a23b,stroke:#b8791f,color:#222,font-size:12px
linkStyle default stroke:#999,stroke-width:2px