Draw a sequence diagram . A travel authorization form is used in most companies to approve travel

expenses for employees. Typically, an employee fills out a blank form and sends it to his or her boss for a

signature. If the amount is fairly small (<$300), then the boss signs the form and routes it to accounts payable

to be input into the accounting system. The system cuts a check that is sent to the employee for the

right amount, and after the check is cashed, the form is filed away with the canceled check. If the check is

not cashed within 90 days, the travel form expires. When the amount of the travel voucher is a large

amount (>$300), then the boss signs the form and sends it to the CFO, along with a paragraph explaining

the purpose of the travel; the CFO signs the form and passes it along to accounts payable. Of course,

the boss and the CFO can reject the travel authorization form if they do not feel that the expenses are

reasonable. In this case, the employee can change the form to include more explanation or decide to pay

the expenses.