 According to common usage, 1 and 3 are regarded as cases of bad science, and only 2 as a case of pseudoscience. What is present in case 2, but absent in the other two, is a deviant doctrine. Isolated breaches of the requirements of science are not commonly regarded as pseudoscientific. Pseudoscience, as it is commonly conceived, involves a sustained effort to promote standpoints different from those that have scientific legitimacy at the time.