Crutchfield, a large U.S. mail-order firm specializing in consumer electronics and personal computers, must evaluate the results of a recent "prospecting" mailing to a rented list of names. A determination of the mailing requires the calculation of the lifetime value of the new customers acquired. Case data on repurchase probabilities (broken out by recency and frequency) support such a calculation. The case can also be used to introduce the RFM (recency, frequency, monetary value) framework for valuing customers.