This publication has the dual aim of becoming a practitioner's guide on the important subject of personal data privacy, containing a detailed exposition of the principles and provisions in the Ordinance and a comprehensive source of reference materials, and of enabling the Privacy Commissioner to discharge his major duty to promote awareness and understanding of the Ordinance.The second edition includes not only a full discussion of these principles but also summaries of all the seminal cases and Administrative Appeals Board rulings in this area, as well as a comprehensive list of all the pertinent cases.