Classify Pair Programming Benefits

(1) Each line of code is looked at by at least two people reducing defect escape rate,Code quality

(2) No islands of expertise develop — any team member can change any part of the code,Knowledge and ownership

(3) Refactoring is more likely to be supported because others immediately benefit from improvements,Process sustainability

(4) The sharing of knowledge during pairing reduces project risk when team members leave,Knowledge and ownership

Explanation

Code quality: informal review by at least two people. Knowledge and ownership: no islands of expertise; knowledge sharing reduces risk when members leave. Process sustainability: refactoring is more likely supported when others benefit immediately.