itwbennett writes "The Drupal community has been working on Drupal 7 for two years, and there are 'hundreds of changes' to show for it, says Drupal creator Dries Buytaert in an interview with ITworld's Esther Schindler on the occasion of Drupal 7 going into Alpha test this week. Most notable for end users are 'some massive usability improvements,' says Buytaert, while site builders will see the greatest changes in the Drupal Content Construction Kit (CCK), which has been moved into the Drupal core. But one thing that hasn't changed is the not-so-easy upgrade path. 'The upgrade path for a Drupal site has never been really easy, to be honest,' Buytaert says. 'We do break backwards compatibility. It's a little bit painful because it requires all of the contributed modules — and there's 4,000-5,000 of them — to make changes.' But Buytaert doesn't think that's all bad. 'Innovation is key. Backwards compatibility limits innovation,' Buytaert contends. 'The rule we have is: We'll break the API if it makes a better API, and if it allows good innovation and progress to be made. Also: The second rule is that we'll never break people's data. We'll always provide an upgrade path for the data.'"