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Developmental Psychology Research Designs

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					Developmental Psychology Research Designs
Adlyn Perez PSYC 452 January 29, 2008

Longitudinal Research Design
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Repeated Measures Design Observations collected from the same individual over time Advantages
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Impact of earlier events can be determined (i.e. environment, education) Can determine intra-individual differences Can show stability of behavior

Longitudinal Research Design
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Disadvantages
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Costly Practice Effects Selective drop-out (selective survival), nonrepresentative samples Less able to generalize across generations due to culture changes (i.e. politics, technology) Difficult to distinguish between developmental trends and historical events

Cross-Sectional Design
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Between Subjects Design Observes different age groups simultaneously Advantages
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Relatively inexpensive Rapid data collection, interpretation and results Can take into account inter-individual differences Light burden on participants

Cross-Sectional Design
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Disadvantages
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Must assume that differences between age groups are developmental and not due to other factors No information on past determinants for observed behavior in separate age groups Selective survival of older participants Snap-shot look at development, doesn’t show how development occurs as a function of change

Sequential Design
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Repeated testing of different age groups over time Combination of longitudinal and sequential design Advantages
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Age groups overlap so that a comparison of different generations at the same age is possible Observing development as a function of change is possible Can generalize results with more confidence than the longitudinal design

Sequential Design
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Disadvantages
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Selective survival is still a problem in maintaining representative samples

Year 2000 2010 2020 2030

Age Groups 20 30 40 50 30 40 50 60 40 50 60 70 50 60 70 80