A composition book makes a great low cost investment. You can write virtually anything you want in a composition book. Many assume these books are only used by school children or writers. That is not a totally accurate assessment. A composition book can be used as a ledger for personal or business reasons. Others may wish to jot down notes on any subject or log insights. A composition book might be rather bare-bones in its design, but this is not an impediment to getting much out of its use. As long as entries are written clearly, a composition book can be easy to review.