Integrity means to act with truth, being honourable, loyal, faithful and trustworthy ad to exhibit “moral excellence and honesty”. The purpose of this research was to provide models of best practice in corporate integrity for public listed companies in Malaysia. This study arose from perceptions that what was reported in corporate governance statements was not always consistent with what was actually happening in the companies. The research is the first of its kind to design an integrity assessment instrument and to assess Corporate Integrity Systems in Malaysian Companies. Specifically, it identified the scope of Corporate Integrity Systems implemented in publicly listed companies, identified appropriate indicators, and verified the reliability of the instrument.