The formal development of reasoning is beyond the scope of this book. However, the application of those social diagnostic processes will come in the form of a brief explanation, in which the social worker's reasoning (whether reasonable or not), unconscious or unconscious assumptions, and his own biases can either facilitate or hinder his diagnosis of the subject's situation. Recognition of the subject's difficulties, like some knowledge in advance, results from the interaction of the two approaches. That is, to directly verify the facts of the subject's life, as we've already seen in the last two chapters, and the unknown facts that can be inferred from these facts.