First of all, no one is without biases. Biases imply that our decisions or opinions about something have already been formed. For example, when we are presented with a puzzle that eludes us, it will continue to elude us so long as we don’t ask the why, the when, the what and the how questions.
These types of questions help us to think beyond our biases thus will give us more objectivity. So without asking questions we may end up doing something based on a false assumption.
Assumptions are really short cuts we use all the time. We assume a chair is suitable to sit on because we based it on our experiences on sitting on many different chairs which in turn forms a generalization that most chairs are suitable to sit on.
Therefore, we don’t test or ask anyone if a particular chair is suitable to sit on. But there are assumptions we must ask the four questions to gather information before we go to the next step.