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Larry Laudan is an American philosopher who contributed to the philosophy of science in the 1970s and 80s. He wrote many works, including ''Progress and its Problems'' (1977), ''Science and Hypothesis'' (1981) and ''Science and Values'' (1984). Laudan’s most notable contribution to the study of scientific change is the idea that scientific methods changein a rational piecemeal fashion, representing a departure from the tradition idea of wholesale change implicit in [[Thomas Kuhn|KuhnianKuhn]] “paradigms's conception of scientific revolutions.” Laudan presented his reticulated model as an explanation for how methods can change and he defended this view from criticisms by prominent colleagues like [[John Worrall]].