Which question pertains to the 'who' in intervention development?

The question regarding 'who' in intervention development specifically focuses on identifying the target population for the intervention. By asking who the intervention will focus on, practitioners can better tailor their strategies to meet the specific needs of that group. Understanding the characteristics, demographics, and specific circumstances of the group allows for the development of more effective interventions that address their unique challenges and contexts related to substance misuse.

This aspect is crucial because different populations may have varying risk factors, cultural influences, and support systems that should be considered when designing an intervention. By clearly defining who the intervention is intended for, prevention specialists can align their goals and methods accordingly, enhancing the overall effectiveness of their programs.

The other options, while relevant to intervention development, do not specifically address the 'who' aspect. For example, determining what substance misuse needs to be addressed pertains more to the content of the intervention, while scheduling the timing of the intervention and ensuring its effectiveness deal with the logistics and evaluation of the intervention rather than the target audience.