A High-Level View
The Books for Geeks team has already developed a set of wireframes for the proposed Web site. Often the wireframes are produced by the HTML design team (either the client's team or an in-house team working with your group). These people are usually somewhat savvy about usability issues and the limitations of the Web, so you, as developer, stand a pretty good chance of being able to use the design as is.
Occasionally, however, you get handed something that's totally unusable. Either the site flow is awkward, it requires the technology to do something that just isn't possible, or it opens up security holes. You could end up going through several iterations with the design team to get an acceptable set of wireframes.
With these ...