Constraints can actually speed development. For instance, we often can get a sense of just how good a new concept is if we only prototype for a single day or week. Or we’ll keep team size to three people or fewer. By limiting how long we work on something or how many people work on it, we limit our investment. In the case of the Toolbar beta, several key features (custom buttons, shared bookmarks) were tried out in under a week. In fact, during the brainstorming phase, we came up with about five times as many “key features.” Most were discarded after a week of prototyping. Since only 1 in every 5 to 10 ideas works out, the strategy of limiting the time we have to prove that an idea works allows us to try out more ideas, increasing our odds of success. Continue reading →