It's been said that companies are only as good as their weakest employee. This truism makes sense because a poorly performing employee reduces productivity at best and makes costly and damaging mistakes at worst. Unfortunately, making sure your team is free of weak links can be a major challenge, as formerly great staff members can sometimes become burned out and unable to perform up-to-par.While an employee suffering from burnout could hurt your organization, the good news is burnout can be easy to spot if you know what to look for.