It is an introduction into CAN basics for apprentices and mechanics new to electronic. The author explains the CAN technology in a simple way. Thus, the booklet may be used as a support document for scholars beginning to deal with CAN. The booklet explains the principles of CAN such as message format, bus arbitration and error check by comparing it to e.g. a telephone line with several apparatuses. Illustrations help visualize bit sequences of the CAN telegrams and explain e.g. bus arbitration in simple language. Simple hints for automotive trouble-shooting are given, too. The brochure is well-suited for absolute beginners to CAN without any background in electronics. Those with electronic or communication background should prefer a detailed text-book or visiting a CAN seminar. The brochure is available at the company’s web site for 17,80 Euro plus postage.