Typically, each band member has an assigned position in each formation. In many show bands and most drum corps, these positions are illustrated in a handheld booklet called a drill book (also known as a dot book). Drill books, or drill charts, show where each person stands during each set of the show. The drill charts include yard lines and hashes as they would be on an actual football field, which shows the band members where to stand relative to the yard lines and hashes. There are many ways of getting from one formation to the next: