A specimen of an identified source acquired for the purpose of comparison with an evidence sample. An example of a person’s writing, a standard for use in comparisons, a “collected” or a “request” specimen. Specimens of...

Exemplar, in the sense developed by philosopher of science Thomas Kuhn, is a well known usage of a scientific theory. According to Kuhn, scientific practice alternates between periods of normal science and extraordinary/revolutionary science. During...