Final answer:
The level of summative evaluation described here is Results. Participants were secretly observed to determine the training effectiveness and outcomes.
Step-by-step explanation:
The level of summative evaluation described here is Results. During the development phase of the purchase order module training, participants were secretly observed at set intervals to determine the effectiveness of the training and identify the need for additional training. The trainers used this observation information to assess the outcomes and results of the training program, such as productivity and profits.