Type:
Session in official program
User personas - fake users everyone has a hand in fleshing out - can ensure your site's functionality and usability and speed up feature launch
Drupal lends itself well to modular, separately deployable code. This means you can often reduce quite large Drupal-based projects to sets of minimum deployable features (MDFs) - informally speaking, chunks of functionality which get a particular job done, and don't look weird on their own - which quickly start to take shape as Drupal development plans.