Given enough time and enough money, you could achieve 100% accuracy, but should you?
It’s all about relative costs and benefits. What does an incorrect order cost? What would it cost to completely remove all errors from your order picking operation? What do you give up to pursue this goal?
If you don’t already know the cost of a mis-pick, you probably should, and that number should include all the relevant costs.
Every operation should pursue 100% accuracy, but the reality is, no one can hit that number for an extended period of time. Most companies focus on a “high bar” number, but that number isn’t 100%. What you’re looking for is the net benefit of your current accuracy rate vs. the net benefit of adding people, technology, and processes to boost your accuracy. You must measure all the costs and benefits of such a program. Does it involve more quality control people? WMS or other technology investments? Automated equipment? Thoroughly analyze the additional costs vs. the overall benefits before you undertake any process to increase accuracy.