critical functions

171activities, services or operations the discontinuance of which is likely, in one or more EEA States, to lead to the disruption of essential services to the real economy or to disrupt financial stability due to the:

1. (a) size;
2. (b) market share;
3. (c) external and internal interconnectedness;
4. (d) complexity; or
5. (e) cross-border activities,

of an RRD institution or RRD group, particularly bearing in mind the substitutability of those activities, service or operations.[Note: article 2(1)(35) of RRD]