I do have a quilting journal, but perhaps it would be more accurate to call it a quilting workbook. Each project has its own section where I write down the date started, name of the pattern, type of batting, dimensions of the block, and sizes of the pieces. I draw out the units on graph paper, write down what type of batting I used, what kind of thread, and the width of the binding. It helps me to be able to refer back to this info as I work. I write down what went well and what I want to do differently next time.