Even if any difficulty arises, the judge will give reasons for his decision, however he will not always tell what the ratio decidendi of case is, and it is then up to a later judge to figure out (elicit) the ratio of the case. However, there may be disagreement over what the ratio is and there may be more than one ratio. Thus, it is not always easy to distinguish ratio decidendi from obiter dictum when evaluating the effects of a particular decision however; when judicial precedent is used, the judge follows or takes the reference of a decision made in a similar past cases that has already been judged upon and he is ruling the same way using the other case as a guideline. Whereas whilst setting judicial precedent the judge renders a decision in a case of a type that had never been tried, or ruled upon in the past, which is completely new, and that his verdict would set the 'precedent' by which all future cases might be judged. Judges, by the way, are not always required to follow precedent in making rulings.