Working with Google Website Optimizer

Google Website Optimizer (GWO) is free system provided by Google to allow you to test alternate content on some of your visitors, running experiments to see which content variations are most effective.

GWO is a client-side technology. It works by altering the content of the page just before it is displayed by the client browser. To do this, the page needs some Javascript scripts installed, to allow GWO to keep track of which visitors are looking at the site, to allow it to alter the display on the pages, and to measure which variations were most effective.

clearString provides comprehensive support for Google website Optimizer integration. 

This covers not just the basics of A/B and multivariate tests, but also provides Ajax delivery options for Query embeds, to ensure that the Google serach engine crawler doesn't penalise you whilst your experiments are running.