We assessed and provided opinion on the contribution of a large number of client comments on a contractor’s design to delaying a large oil & gas project. The objective was to analyse the comments by reference to the contract requirements in order to establish if they were reasonable and necessary and, if otherwise, to quantify the man-hours the contractor would have spent on addressing them. The review concluded that most comments were valid and that the superfluous comments were due to duplication in the way the comments had been made on the documents. The impact valid comments on contractor manhours was insignificant.