The Many Hats of Product Managers – rajiv.com

This is likely a fine read for product managers themselves. Perhaps a checklist to consider where time is going and anything that might be getting lost in the shuffle? However, I think it is a better list particularly for other people to understand the breadth of the role. Product Manager is a difficult job, and the specific definitions are often unique per company. But the idea of a product manager being a "glue" type role that connects many different things together is near universally true.