As mobile devices are getting faster processors and mobile connectivity is becoming much robust, the medium of Internet is getting extended to wider audiences. Usability and UX are becoming an area of focus. Apparently websites and webapps are being accessed from mobile devices increasingly. Customers insists on building interfaces for mobile devices too. At this stage it is vital that compatibility across devices is necessary . Web developers today look towards focused end user groups that can give answers to the following questions. Do you like this site ? If yes why ? What are the elements that you like best / least in the site ? Who do you think should use this site ? Are you able to find the relevant information with navigational ease ? User experience validation today using Agile methods like SCRUM will involve the customer and the focus groups much early into a project. This involves watching what users do rather than just limit to what they say. We at Railsfactory create story boards for developers that focus on Usability and Interaction design features . This is part of the product backlog that gets executed on the early sprint cycles. Earlier cross browser compatibility was tested before the product was staged on the staging server but nowadays checks are being made for mobile compatibilty as well .