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?

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

Consider the following image.

What kind of Web site would benefit most from this kind of layout?

While updating a customer's web site, you want to optimize the look and feel for the site so it is appealing and functional. Which strategy would help with the optimization plan?

In the early days of user interface design web (1990's) designers moved from using tables to organize a layout, to interactive design using Flash. Today, which group of open-source technologies, are commonly used?