Oct 02, 2020 · The material on this site may not be reproduced, distributed, transmitted, cached or otherwise used, except with the prior written permission of Advance Local. Community Rules apply to all content ... For each decision, we have provided a brief summary of the facts, the relevant question(s) presented, and the court’s determination as to whether the contested use was fair. You may browse all of the cases, search for cases involving specific subject matter or categories of work, or review cases from specific courts. Each type of validity has many threats which can pose a problem in a research study. Examples, but not an exhaustive discussion, of threats to each validity will be provided. For a comprehensive discussion of the four types of validity, the threats associated with each type of validity, and additional validity issues see Cook and Campbell (1979).