Think of Whataburger. If you had developed a conditioned response of salivating at the sight of a Whataburger restaurant, but then you drove past the sign multiple times and did not go into the restaurant to purchase anything, then eventually you will stop salivating when you see the sign. This illustrates:.

Awaiver of the requirement for documentation of informed consent may be granted when: the investigator has no convenient place to store signed consent forms separate from the research datathe only record linking the subject and the research is the consent document and the principal risk is a breach of confidentiality.potential subjects might find some of the research questions embarrassing, personal, or intrusivethe subjects are literate in their own language; however, they do not read, write, or speak english