[jsonmez]

We might be mincing words here. But, I think we are agreeing on the basic idea. In my article, I am attempting to say "don't be mean, be nice, and provide positive encouragement, if you disagree, be objective and gentle." I think you are saying the same thing as well, but we are getting hung up on the word "criticism." This is of course my fault, because I was the one who introduced it into the original post.

One powerful set of words I have found when I disagree with someone's viewpoint or find what I perceive to be a weakness in their work is to say.

"Hmm, I like what you said X and Y, but I keep feeling like we might be able to figure out a better way to do Z. What do you think?"

Acknowledging what was good and attributing it to the person, but suggesting an improvement to what was less than good and taking partial ownership for the solution.