A trace relationship between the original requirement and the branch requirement can help you stay in touch with changes that are made to requirements by other teams.
原始需求与分支需求之间的追溯关系，可以帮助您对其他团队对需求所做的变更能保持一致。
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One mechanism that can be used is to establish a trace relationship between the original and the branch requirement (Figure 13. Tracking original and branch requirement by trace relationship).
Documentation is established for what the origin of the branch requirement is (the direction of the trace relationship could be from the original to the branch requirement).