Here’s an article I came across at Medium.com:

Inside a Logo Designer’s Sketchbook:

“Every designer has their own design process, but paper and pen is the first place to start for most. You can quickly sketch and explore ideas with no limitations.

Some designers may choose to work directly on the computer, but personally I find that designs can feel refined and perfected far too quickly without any real experimentation. Sketching on paper allows slight variants to be explored very quickly, and often small mistakes and scribbles can actually form the basis of better ideas. I spend most of my time on the computer anyway, so drawing in a sketchbook is a welcoming break.

The beauty of drawing ideas on paper is that you can scribble without worry. Nobody is going to see your work. You can scribble and doodle for as long as you want. Sometimes an idea might be rubbish, but who cares? Free your mind of those crazy ideas, and doodle until the perfect idea comes together. You don’t need to draw perfectly or be an artist as long as you can produce the final piece. All that’s being put on paper at this stage is the underlying idea, and its for your reference only.”

Lots more to read and additional images at Medium.com.