What group of people is in the best position to determine if the solution works and is right for your company? It’s the people who are going to use it, business people, and end users. Select one from each department to be effected by the new solution.
They will simulate a real production environment, by selecting a small volume of data, but still broad enough in scope to recreate a “day in the life” of your company. This will result in a “model” for production deployment.
Once they use the solution, they’ll have more ideas for improvements. They are experts in their departments. Their feedback will contribute even more to the value of the solution.