Standards
W3C
The W3C (World Wide Web Consortium) is an international organization that develops web standards and guidelines. Those standards have been largely adopted by modern web browser developers and web site designers. When your site is designed using W3C standards, it will be more likely to function in a variety of web browsers and platforms, and will likely continue to function properly for many years, even after new browsers are created and technologies change.
If your webmaster is not familiar with the W3C, you are not getting what you paid for.
Personal Integrity
I take great care to make sure every customer is completely satisfied. My design methods are ethical, my business is professional, and I will respond to your calls and email as quickly as possible.