What do senior testers need to know?

I tried three or four variations of the word "senior" in the title (and leaving it out) before settling on what you now see (pending any edits). This is something I've been spending a lot of time thinking about lately. The long version of the question is - What do experienced testers who don't want to go into management or another discipline need to know to continue to advance their careers?

I think the list includes things like understanding design patterns and patterns of software test. Testability, change impact analysis, analysis of defect removal effectiveness, process improvement, and research probably belong on that list too. Test strategy and long term vision are necessary. Something on the gathering of metrics may also belong on the list. A bunch of the soft skills are important too - communication, managing up, increasing scope, etc.

Anything else? Anything that doesn't belong?