There are many books, magazines and internet forums about model engineering. Magazines such as Model Engineer and Live Steam remain the main source of detailed designs and plans (in addition to carrying news items and discussion of products and techniques). These detailed designs and plans contain instructions and drawings sufficient to build a particular model. In the pages of magazine back-issues, hundreds of such designs exist for all sorts of models. Many of the plans are also reprinted by plans services and model engineering suppliers. Books tend to discuss techniques (sometimes with detailed designs and plans), and forums are active in problem-solving and general discussion. There are also many model engineers' websites or blogs that feature their owners' current and past projects. Some model engineering webzines also exist.