[hendershot]

I've seen the following from pairing Junior and Senior engineers:

* Really talented junior engineers blossom extremely quickly. They will easily be a multiple better after a year vs not pairing.

* Middle of the road junior engineers can be stunted and continually depend on the decisions / skill of the more senior pair. Pairing them more frequently with same level or lower helps. Sometimes this doesn't happen because this lower quality pair goes significantly slower and the result may need some code review/cleanup cycles, but it's a worthwhile investment.

[JackMorgan]

I completely agree, with the right people, pairing to train is 10x faster. For the wrong people, it's 10x slower.