Claims for increased costs for precast concrete work were granted in part by the Civilian Board of Contract Appeals because the government's architect changed contract requirements. The construction contract required a combination of smooth and acid-etched finishes for precast concrete used as the facing for various structures. The contract specified the precast was to appear uniform when viewed at a three-meter distance, and it authorized the architect to reject panels for surface defects or non-uniformity and to adjust the color, which was not specified. The precast subcontractor's attempt to match the architect's sample resulted in a "long and torturous process" of sample submittal and review. The contractor sought the subcontractor's additional costs to provide precast facing that met the architect's demands.