I'd love to hear from the community what you all do to ensure that changes you make will actually improve the user experience.

I'm especially curious about:

• if you don't do A/B testing, why not?
• is your development a data-driven process?
• do you use a server or client-side A/B testing tool?
• what are the metrics you look at to decide whether the experiment was a success?
• how does A/B testing help you understand the cause and effect of changes to your website?

I plan to write another post about web performance and how A/B testing helps tie improvements to the UX metrics back to specific optimizations. Your responses would be helpful context for me!