The accumulative experience is the real matter.Spending life time working in the same field of business is important. its very useful when you are exploring and solving a long run subject or developing some life solutions, like medication drugs or R&D which usually requires you to work for many years to effectively be able to get fine results.I believe also in the other approach and career path, as long as you are not working in R&D, then being diverse in experience is recommended and broad thinking. Being acquainted with knowledge from different fields is a plus. and diversity in experience will help you to think out of the box in many situations, and can expedite your achievements and enhance strategic decision making ability. You will have access to different knowledge that can makes you unique among all your colleagues and partners. You will lead the way and develop the position you handle. keeping all your experience in-line and support each other. You must avoid starting from ground every time with new job. Each new position must be supported from the last experience achieved.Maintenance > installation and commissioning > quality and certification > quality manager > production manager > deputy general manager > .... This is my career history, PERFECT.In every successor job I feel like the predecessor one was of huge beneficial and helped me to excel in my current position, Give me ability to SOLVE and SUPPORT and make it easier to absorb farther knowledge.