
Their attitude towards the job.
I have degrees and am still paid as if I only have a high school diploma. I have exceptional performance reviews, a strong work ethic and still Management doesn't care.
Include the employees and allow development. Don't just talk about it, actually let us move on to the next best thing rather than making it so difficult for us to move on.
If an employee meets the qualifications for a new position they have applied for, they may not be allowed to transfer due to not be allowed to skip more than 2 levels. For example, I am a Coordinator and cannot transfer to a Manager. I would have to quit and reapply as an external employee.