This is the Scan Card System. Some time ago I had ask both the Pen Addict and Office Supply Geek about this system. Then to my embarrassment they go out of business. I have had this system since 1995. This system uses cards instead of lined paper notebooks. It is great for projects. You could also get your cards color coded for priorities. The top two notebooks were called the Diplomat with cards on both sides. Bottom left uses both cards on the left side and a notebook on the right. Bottom right were insert sleeves for binders where you could put cards. My problem now is that I am running out of cards. Still a great system. The cards measure 3 1/4" by 3 1/4".