The ICT permit is fast for temporary intra-group assignments but is restricted as to duration and change of employer; the Blue Card is a personal, long-term status that opens the path to permanent residence. The length of the assignment and the career plan decide it, and the concrete limits make the choice easier: the ICT permit requires at least six months with the group and is capped at three years for managers and specialists, after which the person cannot stay on in Germany permanently. The Blue Card opens the way to permanent residence after a few years of qualified work. So for someone staying in the group for the long term the Blue Card fits, and for a temporary rotation the ICT permit does.
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