1.9 Sub-questions: example

Sub-questions:Beeld: Evalien Langhorst, Hogeschool Rotterdam
X "What is the definition of obesity?"​
Sub-questions are not about formulating definitions. The sub-question should always be needed to answer your main question. 
X "Does nutritional supply influence obesity?​"
That is a closed question. 


Better sub-questions are: 
V "To what extent does the supply of unhealthy food in canteens affect students' diets?"
V "What measures are taken in school canteens to reduce obesity among students?"
V "What influences students' food choices?"​