This volume gives a coherent presentation of the outcome ofthe project PROSPECTRA (PROgram development by SPECificationand TRAnsformation) that aims to provide a rigorousmethodology for developing correct software and acomprehensive support system. The results are substantial: atheoretically well-founded methodology covering the wholedevelopment cycle, a very high-level specification andtransformation language family allowing meta-programdevelopment and formalization of the development processitself, and a prototype development system supportingstructure editing, incremental static-semantic checking,interactive context-sensitivetransformation andverification, development of transformation (meta-)programs, version management, and so on, with an initiallibraryof specifications and a sizeable collection ofimplemented transformations. The intended audience for thisdocumentation is the academic community working in this andrelated areas and those members of the industrial communityinterested in the use of formal methods.