Child Development 133 Research Methods in Human Development
Sections 01 & 05 Hembree Fall, 2012
External and Ecological Validity
I. External Validity
A. Introduction
= ability to generalize your experimental results
B. Three types of generalization:
1. to the population of interest
2. to the environment of interest
3. to the time of interest
C. Threats to External Validity
1) threats based on methods
2) threats based on participants
D. Replication 1. Exact replication
D. Replication
1. Exact replication
2. Conceptual replication
E. Ecological Validity
F. What can we do to improve external and ecological validity? Why should we bother?
II. Discussion Questions
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California State University, Sacramento College of Education Department of Child Development
Updated: August, 2012