OK, David, I know I'm opening a HUGE topic here that really should be an event in and of itself; but we have to talk about it. What are the important topics, considerations, issues, etc. that you see around WLAN troubleshooting and design?
Also taking wireless captures & wifi packet analyzing skills go long way here.
I call that capability :) - when you have coverage AND capacity AND the right features, you have capability.
coverage + features - capacity = no capability
capacity + features - coverage = no capability
coverage + capacity - features = no capability
You gotta have 'em all.