The primary cause of change orders is incomplete or unclear plans and specifications. Ensuring that drawings and specs are fully developed before bidding reduces ambiguity, scope gaps, and the likelihood of modifications during construction.

A (Correct): Complete plans/specs = fewer change orders.

B: Bonds/policies protect financially but do not reduce change orders.

C: Prequalification ensures capable bidders but doesn’t eliminate scope issues.

D: Competent managers/subcontractors help but cannot offset incomplete design docs.