1. Visualize the end product you expect from an individual.
2. Center your instructions around clearly defining that end product.
3. Check the individual's understanding of the results expected by asking open-end questions, that is, those that require more than a 'yes' or 'no' answer.
One day, the village blacksmith, while training an apprentice to shoe a horse, said, "Now, when I nod my head, you hit it with a hammer. Do you understand?" ... "Yes!", said the apprentice. ...The next day there was a new village blacksmith!