In micro-range theory, relationships exist among a limited number of concepts that characterize a specific situation. The working hypothesis (of either the practitioner or the scientist) has the least amount of evidence behind it. The evidence behind this kind of theoretical thinking is not usually accrued by planned repetitions under controlled situations, but instead it is built from a limited number of repetitions and observations. For example, the best way to approach first-time ambulation for surgical patients may be hypothesized by a nurse as the result of providing postoperative care to a series of patients. The theoretical-empirical congruence of this hypothesis is then tested in subsequent surgical patients.