Final answer:
To gain a broader understanding of the process of theory of mind, it would be useful to include variables such as socioeconomic status, parental involvement, and cultural background in the study.
Step-by-step explanation:
When conducting a study on the development of theory of mind, it would be beneficial to include variables such as socioeconomic status, parental involvement, and cultural background. These variables can provide a broader understanding of the process of theory of mind. For example, a higher socioeconomic status might be associated with greater access to resources and opportunities, which could impact the development of theory of mind. Similarly, parental involvement and cultural background can also influence the development of theory of mind in different ways.