An appellate court will not interfere with findings of fact made by a trial court based on credibility of witnesses, as the trial court is in a better position to assess witnesses from having seen and heard them. The exception is where there has been a misdirection, mistake of fact, or where the basis upon which the court a quo reached its decision was wrong. For criminal abuse of office under section 174(1) of the Criminal Law Codification and Reform Act, the essential elements are satisfied where a person in a position of authority (manager) uses that position to engage in unauthorized transactions, manipulates customer accounts without authorization, and derives personal benefit or allows others to benefit, thereby acting contrary to established procedures and to the prejudice of others. The conviction is safe where the cumulative evidence establishes guilt beyond reasonable doubt, including admissions by the accused that undermine his defense.