Users could use the virtual notebook in one hand to find out a description of the current step. They could also return to the instruction board at the entrance to the room. When users choose wrong parameter due to a lack of knowledge, the virtual environment provided no explanatory feedback to support the user's reflection. The instructor's intervention was essential to obtain additional information and succeed in the game. The analysis of the errors allowed us to see that the instructor's intervention during use meant that the user did not make any error relating to the content. The instructor asked several questions to challenge others AESC trainees to get involved and reflect on the situation. In the same time, these questions guided the user through the virtual manufacturing process. Therefore, we note that Simubat 4.0 Gen-2 does not yet enable novice users with lack of knowledge to avoid errors in selecting input parameters during the manufacturing process. In the case of a wrong answer, the user is warned with a message but there is no explanation in our serious game to help them find the right answer. It is then difficult for a novice to find the right answer himself without any explanation or hint.