4.5Cross-Training

Cross-training ensures no single person is the only one who can test a particular feature, use a particular tool, or operate a particular environment.

The Bus Factor Assessment

For each critical QA area, ask: "If this person were unavailable for a month, could the team continue?"

Area	Primary Owner	Backup	Bus Factor Risk
Payment flow testing	Alice	Nobody	Critical -- single point of failure
Automation framework	Bob	Alice (partial)	High -- only Bob knows the infrastructure layer
Performance testing	Carol	Nobody	Critical -- only Carol knows the tools
Mobile testing	Dave	Carol (basic)	Medium -- Carol can cover basics
Test environment management	Alice	Bob	Medium -- Bob can handle routine tasks

Cross-Training Plan

For every "Critical" or "High" risk area, create a cross-training plan:

1. Shadow: The backup person shadows the primary for 2-3 sessions
2. Pair: They work together on real tasks, with the backup doing the work and the primary guiding
3. Solo with safety net: The backup handles tasks independently while the primary is available for questions
4. Independent: The backup can handle the area without support

Timeline: Each step takes 1-2 weeks. Full cross-training for a complex area takes 1-2 months.