A Master Promissory Note (MPN) is a promissory note that does not specify the amount your must repay. When you sign an MPN, you are agreeing to repay all loans awarded under that MPN. In some cases this means multiple loans over multiple academic years (as with Federal Stafford loans). For Federal Perkins loans, ASU has chosen to use the Perkins MPN as a "one-year" note. As such, you will need to sign a new Perkins MPN each academic year.
Before the Student Financial Assistance office is able to disburse loan funds, it must have record that you have completed an MPN for each type of loan you accepted. If you have already completed an MPN at another school, you must still complete one at ASU.