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the relevance of interactions between factors?
# What is the influence of delayed effects of substantive factors on outcomes?
# How do response shifts affect self-report measures?
# How feasible is repeated administration of the same measurement instruments to the same units at different occasions, with a post-test and follow-up tests?
# What about using a proxy pretest?
# Are there confounding variables?
# Should the client/patient, researcher or even the analyst of the data

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