In my las post Pairing can be Unconsciously Powerful, I commented an article (Research shows that two people can learn to cooperate intuitively, but larger groups need to communicate) and explained how …

working in pair you can create what’s called rapport: one of the most important features or characteristics of subconscious communication. It is commonality of perspective: being “in sync” with, or being “on the same wavelength” as the person with whom you are talking. This goes beyond written rules or pre-set methods. As the sync is at the unconscious level, pairing can be unconsciously powerful

Now is this rapport what you really want when, for example, you are pairing in a pair programming session? Yes and no

Yes: if this means establishing a trustful and proactive relationship where the fight to achieve an excellent result takes place;

No: if this means not adding to the couple the necessary tension. This tension is the generative sparkle of the relationship. A good example of this deviation in the case of pair programming is what Francesco define with mamma programming where the two are looking for mutual protection and reciprocal approval.