As Murphey would put it,
"If they can misunderstand it, they will misunderstand it, at the worst time and in the most foolish way."
Reports, specifications and other deliverables must be written so that they can be understood by a contractor. Yet if it is misunderstood, liability will be determined by whether an attorney believes that the contractor should have been able to understand it.
What an attorney thinks is understandable versus what a contractor thinks is understandable are two entirely different things.