Exhibit 99.12 MBNA MASTER CREDIT CARD TRUST II SERIES 1996-A KEY PERFORMANCE FACTORS December 31, 1997 Expected B Maturity 3/17/03 Blended Coupon 6.2162% Excess Protection Level 3 Month Average 5.13% December, 1997 5.19% November, 1997 4.88% October, 1997 5.31% Cash Yield 18.25% Investor Charge Offs 4.64% Base Rate 8.42% Over 35 Day Delinquency 4.81% Seller's Interest 16.15% Total Payment Rate 13.29% Total Principal Balance $34,934,847,924.76 Investor Participation Amount $700,000,000.00 Seller Participation Amount $5,643,513,406.27