Interfaces between different design team members are important on any project, whether between different consultants, between consultants and a tier 1 contractor, or between a tier 1 contractor and its designer tier 2 or 3 subcontractors and suppliers. It is the lack of clarity of these interfaces that can often give rise to project problems and disputes. The design processes described in professional appointments, building contracts, design programmes, and in project execution plans do not always clearly identify the points at which a consultant designer - whether an architect, structural engineer or M&E or otherwise - expects additional detail to be added by the tier 1 contractor through contributions from its appointed tier 2 or 3 subcontractors and suppliers.
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