I like the article's emphasis on your own personal behavior. Is it getting to be always negative? (Perhaps because of the nature of the job).

I come across as negative to most folks outside our group. But to folks inside our group, I'm the one who points out problems AND solutions. If you think your brand-new never-before-examined idea is totally wonderful, then we'll have no problem implementing it. If there are issues, we'll have more problems implementing the later in the process we discover those problems.

The reason folks outside my group view me as a Negative Nellie is because my _first_ question is always about the user expectations--why do you think this process or the new data will actually solve the stated problem?

Most folks can't even clearly state the problem they are trying to solve.
But they've by God got a fer sure solution and anyone who isn't on board is just being negative. That's how I get my reputation, by trying to get managers to focus on clearly defining problems before focusing on solutions.