The principal tasks of Phase Two A, Part 2 of the INTOR Workshop were: (1) work upon certain critical technical issues essential to feasibility and improvement of the INTOR concept; (2) reassessment of the scientific and technical data base supporting the INTOR concept, and (3) revision of the INTOR design. Critical issues studies were carried out in impurity control, RF heating and current drive, transient electromagnetics, maintainability, and technical benefit. The physics, engineering and nuclear data bases supporting the INTOR design concept were re-evaluated, and the design concept itself was, accordingly, slightly modified.