29: Developmental Designs- Cross-section, Longitudinal, and Cross-sequential Last updated Save as PDF Page ID9447 Contributed by Ellen A. Skinner, Thomas A. Kindermann, Robert W. Roeser, Cathleen L Smith, Andrew Mashburn & Joel SteelePortland State UniversityPublished by Portland State University Library 29.1: What are developmental designs?29.2: Why is it challenging to figure how people change with age?29.3: What is the cross-sectional design?29.4: What is a longitudinal design?29.5: Okay, I’m starting to warm up more and more to cross-sectional designs. What are their advantages?29.6: What is a cross-sequential design?29.7: What can we do about the big problem in longitudinal and cross-sequential designs-- that people drop out and that we are changing people by testing them repeatedly?29.8: Which are the best study designs?