A multibillion-dollar company that employs thousands of people would be a behemoth to manage. On the other hand, a company could reach that size only by being well-managed. Tyco – a $10.4 billion company employing 70,000 people – knows the importance of a focused strategy. Last September, Tyco separated into three companies. ADT, a well-known leader in residential security systems went out on its own as a publicly held company. A separate entity, Tyco Valves and Controls, was acquired by Pentair, leaving behind Tyco, a designer, manufacturer, installer and service provider of fire protection systems, life safety solutions and security solutions.