In order to grade the used bits, IADC published the Three Point Dull bit Grading Scheme.

为了对已使用的钻头进行磨损定级，IADC制定了T - B - G钻头磨损三位定级方法。

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Because it cannot fully evaluate the dull bit characteristics, IADC published the Eight Point dull bit Grading scheme to replace the old scheme.

由于其不能全面反映钻头的磨损情况，后来又制定了钻头磨损八位定级方法。

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Esa is a member of the Inter-Agency Space Debris Coordination Committee (IADC), a forum for the worldwide coordination of activities related to the issues of man-made and natural debris in space.

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The other teams working through the IADC will all be using slightly different assumptions in their models and, as a consequence, will all arrive at slightly different timings for the period of impact.

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"It is fair to say this is an optimistic look forward, and the situation will be worse than what we presented in the study, " the UK Space Agency delegate to the IADC told BBC News.

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