Pros
Cummins is a great place for technical knowledge. There are a lot of smart engineers who really know the products. Most people are collaborative and it is easy to access papers and people to ask questions of the experts. Most people want to work together to get a high quality product in production.
Cons
Forced rating and ranking process is full of problems. You either have to kiss managers' butts or else you are not "perceived" to be a good performer. The process is more about how you are perceived by management rather than the actual work you are doing. You could be a great performer and produce high quality work, but if the management team does not perceive you to be doing this work, you will be ranked low. The forced ranking pits everyone against each other and makes for a hostile environment. If managers do not like you, it is impossible to get a good ranking. Hiring and firing of employees seems to be much too cyclical for such a "well governed" company. In just three years, there ahs been a large hriing blitz, two mass layoffs, and now, another large hiring blitz.