We approach this with documentation (using text / wiki), mentoring, and by trading product responsibilities semi-regularly. There are a few cases where speciali

We approach this with documentation (using text / wiki), mentoring, and by trading product responsibilities semi-regularly. There are a few cases where specialized knowledge hasn't changed hands, edge cases, but the cross-training from moving products around has really helped. Also tends to reduce overly-protective ownership of pieces of our product base. On the downside it means not many are "experts" in their product, and it also drives some folks a bit batty. You'll get into a new product, look at a specific bug, pull a string here or there, and then wonder how the Earth is still in one piece. Edit: Yet when employees leave there's generally at least one entire team still with us that built or maintained the product who can fill in and help, if needed.