Based on Ben Horowitz's "The Hard Thing About Hard Things"
A good product manager is the CEO of the product.
Good product managers know the context going in (the company, revenue, funding, competition, etc.), and they take responsibility for devising and executing a winning plan (no excuses).
Bad product managers have lots of excuses:
Good product managers don't get all of their time sucked up by the various organizations that must work together to deliver the right product at the right time. They don't take all the product team minutes; they don't project manage the various functions; they are not gofers for engineering.
They are not part of the product team; they manage the product team.
Engineering teams don't consider good product managers a "marketing resource." Good product managers are the marketing counterparts to the engineering manager.
Good product managers crisply define the target, the "what" (as opposed to the "how"), and manage the delivery of the "what."
Bad product managers feel best about themselves when they figure out "how."
Good product managers:
Bad product managers complain that they spend all day answering questions for the sales force and are swamped.
Good product managers anticipate the serious product flaws and build real solutions.
Bad product managers put out fires all day.
Good product managers take written positions on important issues:
Bad product managers voice their opinions verbally and lament that the "powers that be" won't let it happen. Once bad product managers fail, they point out that they predicted they would fail.
Good product managers focus the team on revenue and customers.
Bad product managers focus the team on how many features competitors are building.
Good product managers define good products that can be executed with a strong effort.
Bad product managers define good products that can't be executed or let engineering build whatever they want (solve the hardest problem).
Good product managers think in terms of:
Bad product managers get very confused about the differences among delivering value, matching competitive features, pricing, and ubiquity.
Good product managers decompose problems.
Bad product managers combine all problems into one.
Good product managers:
Bad product managers:
Good product managers:
Bad product managers: