Let’s say your assignment is to research "popular culture and video games." This is a broad starting point, which is a normal first step.
One way to customize your topic is to consider how different disciplines approach the same topic in different ways. For example, here's how your broad topic of “popular culture and video games" might be approached from different perspectives.
|Education||Video games and special education|
The effect of violent video games on behavior
|Sociology||Homophobia and misogyny in video game communities|
|Health||The effect of video games on health and wellbeing|
|Music||Composing music for video games|
|Computer Science||Architecture of MMORPGs|
|Literature||The role of storytelling in video games|