Can one of you try to combine the two definitions to refine and clarify the definition for archival research? 
  Equivalent Time Samples Design
Nice start, Barbara. What about the equivalence of other potentially influential variables, such as prior therapy experiences? Would that influence  the outcome 

Experimental design
This is a good start but you’re missing some key info. How are participants put into experimental groups? And what about potential confounding variables?

WeekFiveDscussion.docx

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Glossary
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I have selected Archival design, cross-sectional design, experimental design
equivalent sample design, and parametric design for my glossary.
Archival design is a means to gather information without undertaking new research. This method uses old records, databases, and other sources to solve study difficulties (McLeod