This version of the textbook contains significant new content and, so then, does the Solution Manual. These notes are provided to explain some aspects of the new content. The authors of the textbook prepared the new content for the book, including all new questions and problems. I prepared only the answers to the new questions and solutions for the new problems. Many of the questions are broad, open-ended and raise real, practical concerns. The answers that I have prepared are intended to directly address the important concepts raised and provide some of the thought process leading to the answers. Where example applications of the concepts are provided these are intended to be starting points for consideration and discussion, not final, definite or unique answers. Some internet web sites are suggested as example sites containing useful information. These are only suggestions as typical starting points for more in-depth investigation of the questions raised. I am always hesitant to refer to internet web sites since often the updating of them, and sometimes their continued existence, is problematic. Perhaps the best way to view the inclusion of a web site in the Solution Manual is as an indication of questions that are more open-ended and may require more material than is in the text for preparing answers.