These tutorials are presented as Programmed Instruction, that is they present a small amount of information and then prompt for your response. You receive immediate feedback and proceed according to your answer. These lessons should help you learn the course material and prepare for exams. You should know all of the material that they contain, as they are not designed to cover extra material, or cover greater depth, as a reference text would do. Take them honestly, as they will do you no good to try to skim them. In some cases, you must provide the correct answer to proceed. Please take the lessons without using the BACK key. It may be disabled in future versions, but for now avoid its use as it changes the way in which lesson progression is intended. If you need information you have seen previously you will be returned to that information by the program. Please do not use the BACK key.