He has been widely praised outside of New York for pushing to improve the education outcome of poor and minority students, but often sparred with unions and parent groups, particularly over his emphasis on testing.

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As development on the iPhone 4 proceeded, field testing would have been limited because of Apple's emphasis on secrecy, said people familiar with the matter.

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Instead, resources are being focused on the testing of mid-level or companywide controls, putting the emphasis back into longer-term and big-picture issues by utilizing a more efficient, risk-based approach.

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The editors have instead placed their emphasis on the creative aspect of content curation and presentation and on testing assumptions about the resource-intensive nature of magazine publishing.

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