This is the core of my system. Based on a common Bullet Journal spread, this one card has cleaned up the overwhelming majority of my system complexity. It is a Calendar, Habit Tracker and Habit Score Cards, and Task Manager all in one. Extreme portability makes it effortless to keep at hand, and it takes a single glance to remember the entire landscape of the next few weeks - a whole month if you choose to carry two cards instead of the one. The weekly ToDo List on the back helps to keep recurring tasks at the top of mind while keeping my general list uncluttered.