This title constitutes the refereed proceedings of the 4th International Conference on Foundations of Software Science and Computation Structures, FOSSACS 2001. The 25 revised full papers, presented together with an invited paper and a tool presentation paper, were carefully reviewed and selected from a total of 63 submissions. Among the topics covered are algebraic, categorical, logical, and geometric theories, models, and methods supporting the specification, synthesis, verification, analysis, and transformation of sequential, concurrent, distributed and mobile programs and software...

These proceedings contain a selection of refereed papers presented at or related totheAnnualWorkshopoftheTYPESproject(EUcoordinationaction510996), which was held during May 2-5, 2007 in Cividale del Friuli (Udine), Italy. The topic of this workshop was formal reasoning and computer progr- ming basedon type theory: languagesand computerized toolsfor reasoning, and applications in several domains such as analysis of programming languages, c- ti?ed software, formalization of mathematics and mathematics education. The workshopwasattended by morethan 100researchersandincluded morethan 40...