Individual skill
devpsych-study-design
Use when designing studies for a Developmental Psychology (APA) manuscript so they can actually support a developmental-change claim. Covers age-appropriate experimental and longitudinal designs, age vs. cohort confounds, attrition, measurement invariance across ages, sample-size justification, and ethics with minors and vulnerable populations. Strengthens the design and pre-analysis plan; it does not write code.
Developmental-Psychology-Skills/skills/devpsych-study-design/SKILL.md
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# Study Design (devpsych-study-design)
A developmental design must support a claim about **change**, not just measure something at different
ages. Developmental Psychology reviewers probe the four threats that are specific to this field: **age
vs. cohort confounds**, **attrition**, **measurement invariance across ages**, and **age-appropriate
ethics and task validity**. This skill hardens the design before data collection.
## When to trigger
- Planning a cross-sectional, longitudinal, accelerated, micro-genetic, or experimental developmental study
- Writing a preregistration / pre-analysis plan for developmental work
- A reviewer questioned age confounds, attrition, invariance, power, or ethics with minors
- Justifying sample size for a growth model or an age interaction
