THE RESULTS OF RESEARCH AND DEVELOPMENT ON STRATEGIES FOR DEVELOPING SOFTWARE FOR COMPLEX, CONCURRENT TASKS IS DESCRIBED. A THREE-STAGE HIERARCHY FOR REAL WORLD MODELING (TRITRANS) AND A PROGRAMMING LANGUAGE AND CONCEPT THAT STRICTLY ENFORCES OBJECT-ORIENTED PROGRAMMING TECHNIQUES (CONCUR) IS INTRODUCED. BOTH CONCEPTS ARE OF GENERAL BENEFIT FOR SOFTWARE DESIGN AND DEVELOPMENT. THEIR FULL POTENTIAL IS REACHED WITH CONCURRENT, INTERACTIVE PROCESS AND COMPOLEX PROBLEM-SOLVING ALGORITHMS. STRONG EMPHASIS IS PUT ON DEMONSTRATING HOW THESE RESULTS CAN BE USED WITH IMMEDIATE BENEFITS FOR EVERY PROGRAMMING LANGUAGE AND SYSTEM ENVIRONMENT.