It's clearly a matter of situation. Most of the times I can't imagine working effectively and productively using pair programming technique, but there are situations in which it can be very handy.
Just imagine a scenario in which one developer is an expert in some technical matter and the other has some project-specific knowledge. Why not use pair programming to develop a feature that requires both of those? It surely will decrease the development time and everyone will learn something new.
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It's clearly a matter of situation. Most of the times I can't imagine working effectively and productively using pair programming technique, but there are situations in which it can be very handy.
Just imagine a scenario in which one developer is an expert in some technical matter and the other has some project-specific knowledge. Why not use pair programming to develop a feature that requires both of those? It surely will decrease the development time and everyone will learn something new.