What characteristics are most heavily weighted in choosing work partners?

These are some of the characteristics that are most heavily weighted in choosing work partners, according to the article "Competent J.erks, Lovable Fools:"
1. People choose work partners who are more likable
2. Studies done in four very different organizations consistently showed that most people would choose a “lovable fool” over a “competent j.erk”
3. Characteristics of competence and likeability