“In an earlier article ‘Monkey Instruction’, we addressed the issue of effective writing for online instruction. We asked why some online courses are boring and analyzed a Webmonkey course to understand its writing style that makes it such a popular course. In planning for this article we looked at several resources, addressing disparate issues, conflicting theories, numerous principles, techniques and rules — that it was difficult to bring them all together in one article. Hence we have decided to tackle them in a series of parts, with each part devoted to one set of guiding principles or a specific resource. Part I of the article analyses Edward Tufte’s principles of visualizing information.”