HORIZONTAL EUROPEAN ACTIVITIES IN REHABILITATION TECHNOLOGY (HEART). LINE A: STANDARDS, TESTING, CERTIFICATION-SPECIFICATION OF REHABILITATION TECHNOLOGY. A.1.3.: REHABILITATION TECHNOLOGY TESTING AND PROPOSALS FOR NETWORKING. A.2.1.: EXISTING STANDARDS AND CURRENT STANDARDIZATION WORK. A.2.2: NEEDS FOR NEW STANDARDIZATION. A.2.3.: NEW AND MORE EFFICIENT STANDARDIZATION FOR USERS WITH DISABILITIES. A.3.3.: USER VALIDATION OF REQUIREMENTS AND TESTING. A.3.4.: A MODEL FOR USER INFLUENCE ON STANDARDIZATION