Should the project manager contract for a steel design, a concrete design, or both?

What factors would cause the two cost estimates to be positively correlated?

• What factors would cause the two cost estimates to be negatively correlated?

• Do you think, on balance, that the two cost estimates would be positively correlated, negatively correlated, or uncorrelated?

• Given your answer to the question above, should the project manager contract for a steel design, a concrete design, or both?