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|Criticism=In 1988, John Worrall responded to Laudan’s [[Laudan (1984a)|''Science and Values'']] in a paper titled [[Worrall (1988)|''The Value of a Fixed Methodology'']]. Worrall seeks to demonstrate how the reticulated model is incorrect by stating that there is after all a core unchangeable method of theory evaluation. According to Worrall, Laudan's alleged historical examples of changes in methods are all examples of changes in explicitly stated methodologies. Implicit criteria that scientists actually employ in theory assessment, according to Worrall, remain static. Thus, according to Worrall Laudan's reticulated fails as it tries to explain something that doesn't really exist, i.e. changes in the implicit method of science.[[CiteRef::Worrall (1988)]]
Laudan replied to Worrall’s criticism in 1989 in his [[Laudan (19891989a)|''If it Ain’t Broke, Don’t Fix it'']]. Laudan points out that Worrall has conceded to the possibility of changes occurring in “implicit methods” and that these changeable methods are all subject to bigger principles of science which are unchangeable.[[CiteRef::Laudan (19891989a)]]
Worrall's final reply cape in his [[Worrall (1989)|''Fix it be Damned: A Reply to Laudan'']]. Worrall claims that he and Laudan do not have a disagreement on the level of methods changing but they do at the methodological level. Worrall believes that even if some of these beliefs can be changeable there are also ones that are unrevisable. It is under the purview of this fixed element that scientists can do science.[[CiteRef::Worrall (1989)]]
