Learning from the students at Swinburne

For many new students, the best way to make it difficult for them to actually find a book, is to give them the book's call number and send them on their way. If you were told that a book was on the shelves at '658.403 MAR', would you know what that actually means? Is the book on the sixth floor because the call number starts with a '6' or is it in the marketing section as the call number ends with 'MAR'? Or does the '403' mean that it is the four hundred and third book in the 658 section, so would logically be shelved after 658.49. All are very reasonable assumptions for a person who has never previously encountered the Dewey Decimal Classification (Dewey).