Answer Happy

Findlay Healthcare is a Cincinnati-based tier-one supplier of pharmaceutical drugs. Between 2010 and 2016, Findlay Healthcare installed a project management methodology based upon twelve life cycle phases. All 40,000 employees worldwide accepted the methodology and used it. Recently, Findlay Healthcare decided to expand its services and include durable medical supplies. In an effort to be successful, they contracted the assistance of another tier one supplier named Atlanta Supplies. Atlanta Supplies used a 7-step life cycle process that was also very successful. Since the employees from both companies would be working together, a singular methodology would be required that would be acceptable to both companies. Both methodologies had advantages and disadvantages and their customers liked both.
How do companies combine their methodologies?How do you get employees to change work habits that have proven to be successful?What influence should a customer have in redesigning a methodology that has been proven to be successful?What if the customers want the existing methodologies left intact?What if the customers are unhappy with the new combined methodology?