CRAP

     All design starts from four basic principles, abbreviated as CRAP .These are Contrast, Repetition, Alignment, and Proximity.


     Contrast: Contrast refers to any difference of size, shape, or color used to distinguish text  from other pieces of text. The use of bold or italics is one common form of contrast — the difference in shape makes the bolded or italicized text stand out from the surrounding text. Increasing the size of headers and titles, or using ALL CAPS or smallcaps are other ways of distinguishing text. These techniques only work if used sparingly; a document typed in all capital letters has less contrast than one typed normally, so is harder, not easier, to read.


     Repetition: Repetition in your text is bad; repetition of your design elements is not only good but necessary. Once you’ve decided on a size and typeface for second-level headers, for instance, all second-level headers should look the same. For most documents, two or maybe three fonts — leaning heavily on one for all the body text, with the other two for headers and maybe sidebars — are enough. The same bullets should be used on every bulleted list. Information that appears on every page should appear in the same place on every page. Design elements — like horizontal rules between sections or corporate logos — should appear the same whenever they are used throughout the document. Repetition of design elements pulls the document together into a cohesive whole, and also improves readability as the reader comes to expect text that looks a certain way to indicate certain qualities.


     Alignment: Alignment is crucial not just to the cohesive appearance of your document but to the creation of contrast for elements like bulleted lists or double-indented long quotes. Your document should have a couple of vertical baselines and all text should be aligned to one of them. Unaligned text floats mysteriously, forcing the reader to figure out its relation to the rest of the document. Centered text is particularly bad . One immediate step you can take to vastly improve the appearance of your documents is to remove the “center” button from your software’s toolbar .It is rarely self-evident what centering is meant to communicate, and too much centered text creates a sloppy, undisciplined look.


     Proximity: Pieces of information that are meant to complement each other should be near each other. One great offender here is business cards and ads in local newspapers, where the name, address, and phone number are all scattered around the ad or card .Your reader shouldn’t have to seek out the next logical piece of information; rather, use proximity to make sure that the next piece of information a reader sees is the next piece of information they should see.


     None of these principles stands alone. Repetition and alignment together create the “normal” state that allows changing the shape or position of a piece of text to produce contrast; repetition and proximity go hand-in-hand to create useful formats like bulleted lists — the repetition of the bullet adds force to the proximity of the points. In fact, the bulleted list above uses all four of these principles to work: it contrasts with the body of this article by being aligned to a different baseline than the rest of the paragraphs; each principle is in boldface, providing contrast, and is also directly followed by its explanation, providing proximity; the bullets, the boldfaced text, and the alignment are repeated in each new point on the list.
Almost all design builds on the foundation laid out above. Asking yourself how well each element of your layout satisfies these basic principles is a good way to make sure your work remains readable to your audience while also communicating a bit of your organization’s or business’ character. You may already unconsciously use these principles in your work, but knowing the principles and recognizing their use will help you make better, more conscious decisions in the future.