With our latest project Farmanac, an iPhone app for fruits and vegetables, 2 Out of Three dove headfirst into app development. We spent days reading through Apple’s Human Interface Guidelines (HIG) and mocking up navigational models and screen flows. For the initial release of Farmanac we kept the feature set and navigation simple by using a basic list view which leads to a detail screen for specific items. But we’ve got a number of features we plan on implementing in subsequent versions that will require a more complex navigational model – which probably means introducing a tab bar. Luckily for us, Petter Silfver recently shared his thoughts concerning the do’s and don’ts of tab bar design in an article titled The iPhone Tab Bar, Lessons From Reality.