The ParaScope Editor is a new kind of interactive parallelprogramming tool for developing scientific Fortranprograms. It assists the knowledgeable user by displayingthe results of sophisticated program analyses andby providing editing and a set of powerful interactivetransformations. After an edit or parallelism-enhancingtransformation, the ParaScope Editor incrementally updatesboth the analyses and source quickly. This paperdescribes the underlying implementation of theParaScope...