Many different formats are used to structure information and make it easier to find and to understand, later. The format of the initial record may often be informal and/or unstructured. One common format for such notes is shorthand, which can allow large amounts of information to be put on paper very quickly. Note-taking is an important skill for students, especially at the college level. In some contexts, such as college lectures, the main purpose of taking notes may be to implant the material in the mind; the written notes themselves being of secondary importance. Historically, note-taking was an analog process, written in notebooks, or other paper methods like Post-It notes. In the digital age, computers, tablet PCs and personal digital assistants (PDAs) are common.
Note-taking is a race against time. The note taker typically is under severe time pressure, and different note-taking styles and techniques try to make the best use of time. The average rate of speech is 2–3 words per second, but the average handwriting speed as only 0.2–0.3 words per second.