Pair programming — two developers, one keyboard, working on the same code simultaneously — has passionate advocates and passionate skeptics, and the honest answer depends heavily on the task and the pair.
Where the Evidence Genuinely Supports It
- Genuinely complex or unfamiliar problems, where two perspectives catch mistakes a single developer would miss
- Onboarding — pairing a new hire with an experienced developer transfers tacit codebase knowledge far faster than documentation alone
- Code review essentially happens continuously and in real time, rather than as a separate, delayed step after the code is already written
Where It Genuinely Doesn’t Pay Off
- Simple, well-understood, mechanical tasks — pairing here is often close to pure overhead with little compensating benefit
- Personality/pace mismatches — a fast, exploratory thinker paired with a slow, careful one can genuinely frustrate both, actively reducing productivity rather than improving it
- Deep, sustained focus work that benefits more from uninterrupted solo concentration than real-time collaboration
The honest, evidence-supported conclusion: pair programming is a genuinely valuable tool for specific situations (complex problems, onboarding, knowledge transfer), not a universal practice that should apply to 100% of development work regardless of task — teams that mandate it everywhere, or ban it everywhere, are both missing real value the deliberate, situational version offers.