Exhibit 99.23 MBNA MASTER CREDIT CARD TRUST II SERIES 1996-M KEY PERFORMANCE FACTORS SEPTEMBER, 1997 Expected B Maturity 12/15/06 Blended Coupon 5.9327% Excess Protection Level 3 Month Average 4.57% September, 1997 4.72% August, 1997 4.52% July, 1997 4.47% Cash Yield 17.48% Investor Charge Offs 4.80% Base Rate 7.96% Over 35 Day Delinquency 4.84% Seller's Interest 12.31% Total Payment Rate 12.46% Total Principal Balance $ 30,549,822,447.26 Investor Participation Amount $ 500,000,000.00 Seller Participation Amount $ 3,759,687,928.77