Ajax has recently been used most prominently by Google for projects such as Gmail and Google Maps. However, creating a large application in this framework is very difficult (echoed by the “lunch interviewer” in Google), as many different technologies must interact to make it work, and browser compatibility requires a lot of effort. In order to make the process easier, several open source Ajax Frameworks have been developed, as well as commercial frameworks.
Ajax complicates software testing activities. These complications lengthen the software development process.