My day to day notebook is a soft 5 inch by 3.5 inch pocket notebook as shown below. I use a mechanical pencil when out and about (no breakage or sharpening) and take a small eraser (in this case an eraser shaped like Lego). This book is good for notes and ideas. Notice I cross them out when I have acted on them in some way (done the work, or given up on the idea). The goal of the daily notebook is to eventually throw it away (not save it). So all work needs to move out and I need to be able to know it has been moved.

We still do not understand how information practices from the worlds of learning, finance, industry, and administration cross-pollinated. From the fourteenth century onward, accountants developed complex instructions for note-taking to describe holdings and transactions, as well for the recording of numbers and calculations. By the seventeenth century, merchants, and indeed ship captains, engineers, and state administrators, were known to travel with trunks of memoranda, massive inventories, scrap books, and various ledgers and log books that mixed descriptive notes and numbers. By the eighteenth century, tables and printed forms cut down on the need for notes and required less description and more systematic numerical notes. Notaries also were master information handlers, creating archives for their legal and financial documents and cross-referencing catalogue systems.