Logical form and the link between premise and conclusion

This paper challenges the idea that purely formal or syntactic concepts can, in general, supply criteria for certifying that the premisses of arguments and inferences support their conclusions. It will maintain that neither deductively valid arguments nor inductively strong arguments can, in general, be identified by their logical form. The paper will attempt to clarify the role that patterns play in appraising arguments. Using argument schemas as an example, it will try to show that the identification of patterns can facilitate appraisal even when those patterns do not supply criter ia (sufficient or even necessary conditions) of support