Prior to the 1970s and 1980s, fibromyalgia represented an amorphous set of symptoms and definitions-local, regional, or widespread pain with or without other symptoms, including, for some, the idea of "psychogenic rheumatism" (1). The American College of Rheumatology (ACR) 1990 criteria de facto established and redefined fibromyalgia to require the presence of widespread pain and multiple (Ն11) tender points (2). The 2 criteria items were measures of pain, and their diagnostic cutoff levels were determined by comparing patients with fibromyalgia to those without it. But who were the original patients with fibromyalgia and what were they like, this group that constituted the gold standard?We know now that they were chosen in part by individual physician tolerance of the presence and severity of somatic symptoms, and by the degree of patient distress. The subsequent idea that the 1990 criteria were just about pain was not correct: the criteria implied substantial, if unmeasured, symptomatic distress. In clinical practice after the 1990 criteria were adopted, it was symptoms that made the clinician think of fibromyalgia-and the tender point examination that sometimes followed.Tender points, the "semi-objective" physical finding, were elusive. Most physicians did not know how to carry out the tender point examination and generally skipped it. When performed, it was most often done incorrectly. The cervical tender points were almost impossible to assess correctly; body habitus and behavioral characters interfered with criteria-provided instructions, and no one really used (or understood) the recommended 4 kg of force. When physicians began the tender point examination, the patient's interview had already provided clues as to what the examination results might be. It is fair to say that the examination may have been influenced by physician beliefs as well as by the contributions of patients. The fibromyalgia examination provided an approximate estimate of tender points-easy at the extremes of tenderness, but much more uncertain in the important middle. Fibromyalgia diagnosis often depended on physician referral, behavioral and emotional characteristics of patients, and the skill, interest, and beliefs of the physicians. Different physicians could and often did come up with different results. In the absence of careful training, the easy assumption that the examination was reliable was usually an untested and dubious assumption.The 2010 ACR criteria approached the fibromyalgia identification problem differently (3). Using the 1990 ACR criteria as the gold standard, fibromyalgia criteria were constructed that excluded tender points, but included a count of pain locations and the physician's rating of the most discriminative symptoms. In these criteria, musculoskeletal pain accounted for about 50% of the criteria score, while the other 50% came from fatigue, sleep, cognitive problems, and an estimate of the overall degree of somatic symptom severity. The relative contributions were not fixed, and it was possible for patie...