Encouraging the Process
A good way to increase productivity among employees is to recognize good work. Not just praising the outcome, but encouraging the process in which produced the outcome. If you are continually praising only results, you are not reinforcing the most important part of the process.
Also, praising just results may lead to unrealistic expectations which places unwanted stress on the employee and may fill them with anxiety if they cannot duplicate their previous results.
It is far more efficient and less stressful on employees if you encourage the process, like commending them on great preparation, good research, hard work and dedication instead of only praising outcomes which projects expectations that will be very difficult to continuously repeat.
It is easier to replicate a process then to replicate a result. As a manager you want to really praise the employee on how they achieve the result so they know their hard work is being recognized and appreciated.