There's so much more to the hiring process than the interview. That is just one piece of the puzzle. A clear job description for the position is the best start. Using the Kolbe Assessment in the process will increase your probability of hiring well.
There is so much more to retention than a paycheck. This starts again with a good job description and regular review to see how the employee is developing. The staff member should have personal goals as well as work goals. Their supervisor should regularly follow up on these and encourage progress and celebrate along the way.
We have tools to use for minor corrections and guidance for bigger issues. Prevention is the key. Next dealing with issues right away with accountability and consequences.