Selectivity and Discord addresses the fundamental question of whether there are grounds for belief in experimental results. Specifically, Allan Franklin is concerned with two problems in the use of experimental results in science: selectivity of data or analysis procedures and the resolution of discordant results. By means of detailed case studies of episodes from the history of modern physics, Franklin shows how these problems can be - and are - solved in the normal practice of science and, therefore, that experimental results may be legitimately used as a basis for scientific knowledge.