(a)  During all phases of the project, the architect-engineer contractor that is providing design services under a separate contract with GSA is contractually responsible for the design in the same manner as under a traditional, design-bid-build project delivery method.

(b)  The design phase services provided by the construction contractor can include, but are not limited to, scheduling, systems analysis, subcontractor involvement, cost-estimating, constructability reviews, cost-reconciliation services, and market analysis.

(c)  The scope of work should task the construction contractor with reviewing the design documents and providing pricing information at various defined milestones during the design phase.

(d)  During the design phase, the architect-engineer contractor and the construction contractor shall collaborate on the design and constructability issues. The goal of this collaboration is to establish a final ECW that does not exceed the original target ECW.

(e)  No discussions between the architect-engineer contractor and the construction contractor shall be considered as a change to the construction contract or design contract unless incorporated by the contracting officer through a modification.