This volume contains the finalversionsof the invitedlecturespresented at the "InternationaleUniversitatswochen ffirKern- und Teilchenphysik" in Schladming, Austria,February 1992, which was held under the topicaltitle"Computational Methods in Field Theory". A subject likethe one discussed at our school would have been impossible at the firstschool in the series,30 years ago. Field theory at that time was limitedto analyticattempts fora solutionsuch as Feynman graphs perturbation series;computational techniques were clever applicationsof the theory of specialfunctions.