The secret origin of strong-style pairing with Llewellyn Falco

Many discoveries happen by mistake. It turns out that strong style pairing was discovered by mistake by Llewellyn Falco.

This is an excerpt from a longer conversation with Llewellyn.

Llewellyn Falco is an Agile Technical Coach specializing in Legacy Code and Test Driven Development. He is the creator of the open source testing tool ApprovalTests (, contributor to Mob Programming, co-founder of TeachingKidsProgram ( and a PluralSight author.

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