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Jim Sinegal would receive a grade of $"B"$ for his effectiveness as a CEO; his approach was aggressive, which made him intimidati store managers.

Jim Sinegal spent a lot of time in the stores, checking out store layouts and merchandising, and speaking with employees.

Craig Jelinek is doing a very creditable job of following in Sinegal's footsteps.

Craig Jelinek would receive an $"A"$ for following Sinegal's footsteps and continuing with the same strategy.

Jim Sinegal was known as a transactional leader focused on the financial side of operations rather than on employees.

Jim Sinegal and Craig Jelinek have been effective CEOs. Jim Sinegal, in particular, did a superb job of strategic leader$-$he merits grade of A$+$ for his performance. Craig Jelinek's job at Costco has been made far easier because of all the things Sinegal did and accomplished.