If you are yet to properly limit your WIP, today’s dose of common sense from Lean Software Development: An Agile Toolkit, by Tom Poppendieck and Mary Poppendieck, may be beneficial to you.
“A big pile of in-process work holds additional risks besides obsolescence. Problems and defects, both large and small, often lurk in piles of partially done work. When developers create a lot of code without testing, defects pile up. When code is developed but not integrated, the high risk part of the effort usually remains. When a system is complete but not in production, risks remain. All of these risks can be significantly reduced by shortening the value stream.” – excerpt from Chapter 4. Deliver as Fast as Possible