Exhibit 99.27 MBNA MASTER CREDIT CARD TRUST II SERIES 1997-F KEY PERFORMANCE FACTORS July 31, 1997 Expected B Maturity 6/17/02 Blended Coupon 6.4268% Excess Protection Level 3 Month Average 2.78% July, 1997 2.78% June, 1997 N/A May, 1997 N/A Cash Yield 17.12% Investor Charge Offs 4.54% Base Rate 9.80% Over 35 Day Delinquency 4.47% Seller's Interest 18.18% Total Payment Rate 14.22% Total Principal Balance $30,179,392,749.44 Investor Participation Amount $706,000,000.00 Seller Participation Amount $5,486,155,230.95