The above-mentioned result came from various factors, mainly, the factor of culture and history, the factor of "testing emphasis", the factor of normal school education; the factor of teaching mode itself and the factor of teachers etc.
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.
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.
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.