The main question is the central research question and corresponds to or is directly derived from the problem statement. This question is the starting point of your search. The main question describes exactly what you want to know and gives direction to your search. It is therefore important to formulate your question well.
A good question can be recognized by the following aspects:
The question is clear. The terms in the question are also clear. With a vague question you can go either way.
The question is specific. You want to be able to search specifically. With a general, broad, ill-defined question you will quickly get lost in a mass of information.
The question is relevant. The answer to the question must contribute directly to solving your "information problem" and achieving your objective.
The question is asked "open-ended." Thus, it is not a question to which only "yes" or "no" can be the answer.
It is possible to find an answer within the time available.
The means to find the answer are adequate.
Only when you have formulated a specific question that gives direction to the search process and makes clear exactly what you want to know can you search in a focused and effective way.
Example:
Bad question: Are there problems in child care?
It is closed, only "yes" or "no" is possible.
it is vague and not specific: with "problems in childcare" you can go either way
the question (if open-ended) is too broad, not focused and probably not answerable in the time available.
Better question: what is the effect of feedback training on the interaction skills of pedagogical staff in childcare?
it is open-ended
it is quite specific by choosing a type of intervention, a study population and an outcome measure
the question is answerable; obviously depending on your available time