51.   But the Bush approach did have one merit.

52.   But this approach has its own difficulties.

53.   But this approach has several limitations.

54.   But this campaign official acknowledged that the anti-Congress approach has yet to take off.

55.   But this approach has an obvious problem.

56.   Clearly, though, this approach is having a hard time.

57.   Despite the difficulties involved, many environmental specialists say the approach has great promise.

58.   Each approach has advantages and disadvantages.

59.   Each approach has its weaknesses, says Minow, writing in Net magazine Slate.

60.   Even backers concede the pre-commitment approach has yet to achieve the necessary level of detail to become reality.