Why website navigation that is easy to understand so important?

You are consulting on the development of a complex Web site for an airline maintenance company. It will contain a large library of technical information. Maintenance technicians will use the site to understand the requirements of their jobs, the physical structure of the airplanes, and other important information. They will need to refer to different areas of the site frequently. What kind of positional awareness tool should be included to help navigation through the site?

The participatory design process includes witch of the following techniques?

A web site designer is using percentage based dimensions to allow a web site to shrink or enlarge according to the browser and device screen size.

When starting a new project, many website designers develop a single page that includes all the fonts, sizes, white space, and colors they want. This becomes their page template for the rest of the site. Why is this practice important?