Study Design — The Multi-Study Package (jpsp-study-design)

This is the skill that most distinguishes JPSP from short-report journals. A JPSP paper is a coherent set of related studies built to test a theory, not a single experiment. The package must converge: each study should add something the previous one could not establish, and the set should withstand the question "could one study break the whole story?"

When to trigger

• Planning the sequence and roles of studies in the package
• Powering each study and the package as a whole
• Choosing designs (experiment, survey, longitudinal, dyadic/APIM, intensive-longitudinal, archival)
• Deciding what to preregister and what is exploratory

Designing the package