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Copperfield Books Copperfield Books Copperfield’s Books Inc. – 2004 Case Questions 1. Prepare an External Factor Evaluation (EFE) matrix. Use 10 to 12 factors. No more than 60% may be opportunities or th (balance). 2. Prepare an Internal Factor Evaluation (IFE) matrix. Use 10 to 12 factors. No more than 60% may be strengths or.