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Tip One: Review basic issues in research design from Campbell and Stanley (1963) - http://www.fmarion.edu/~resdes/design/basicdes.htm. This web page includes designs that deal with threats to internal and external validity. Tip Two: Review threats to internal and external validity with this summary - http://www.ithaca.edu/beins/methods/demos/threat1.htm - and table - http://www.biomedcentral.com/1472-6882/1/12/table/T1. Tip Three: Review experimental designs and threats to internal and external validity with this summary - http://seamonkey.ed.asu.edu/~alex/teaching/WBI/threat.html - and this one - http://www.education.monash.edu.au/units/edf6001/components/stranda/strandaSession6Notes.html.
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