Design$-$Bid$-$Build differs from Design$-$Build because:

a$)$ The contract is negotiated and not a competitive bid

b$)$ Design$-$Bid$-$Build is inherently riskier and more costly

c$)$ In Design$-$Build, the contractor and the designer$/$engineer are under the same contract and are working as a team

d$)$ There are three steps in design$-$bid$-$build instead of the two steps in design$-$build design$-$bid$-$build cannot be fast$-$tracked