A style guide is a set of standards for the writing and design of documents and materials. A design style guide usually addresses logo usage, fonts, colors, and sometimes page layouts.
The use of a design style guide provides uniformity in the application of graphic elements and the formatting of materials. The goal is to achieve a consistent appearance across all materials — one of the foundations of visual branding.
Style guides for writing can be extremely in-depth, such as the Associated Press Stylebook, which details writing styles for comma use, abbreviations, titles, and much more. (A subject for a future post by one of my colleagues, I'm sure.) Or for design, it could focus solely on one element such as brand name use and appearance. A design style guide can be as simple as a couple of pages of logo usage examples, or as complicated as an entire binder (or website) created by a franchisor or multinational to cover every possible application of the identity.
Every company with a designed identity or brand mark needs a design standard. It serves as a reference for your in-house team, or for any external designers or agencies you work with. A style guide helps to:
At a minimum, a basic design guide needs to have the following:
A note on color: When creating a brand name or symbol (a.k.a. logo), we start with black and white. After the image and shape are established, a color palette is developed beginning with solid colors for spot printing, then looking at process and web conversions.
The short answer is never. A good designer and production manager will always reference the brand standard. But, it is a starting point. Sometimes material is not included in the style guide – such as preference for logo use for co-branded marketing materials. And sometimes it will be necessary to update the guide to reflect changes in conventions and brand or company personality.
To wrap up—a style guide is always helpful. If I had the writing style guide for this blog - I would have known if the headline and subheads should be all CAPS, initial caps or simply sentence case. I'll trust the copy editor to fix it.
Designing Style Guidelines for Brands and Websites (Smashing Magazine)