How can you optimize your Web site for accessibility by visually challenged persons on any device (computers, laptops, tablets, mobile phones)?

You are reviewing the results of usability tests for your website. Several of the comments stand out as "red flags" mentioning that for colorblind visitors or those who viewing the site on mobile devices are experiencing confusion with readability or navigation. Which principle of visual design should you revisit to make the necessary improvements?

You are including both a site map and a navigation bar on your website. What is the rationale for doing this?

You are working on a medium sized website for a company that organizes art fairs. On their website, they have three types of pages. One type of page is for recruiting investors in the company. Another type of page is for selling both spaces to artists via ecommerce. And the third type of page is promoting the art fairs to the general public. The company has received feelback that the site is confusing, disorganized, and difficult to navigate through. How can this be corrected?

Your web developer has presented a report of a focus group's review of your new website. The report contains information on the amount of time the group spent on the site, the number of clicks required to navigate, and the general pattern of navigation. What kind of testing was the focus group performing?