for which the Government is responsible as opposed to its own; the contractor's standard for proving damages does not require "absolute exactness or mathematical precision." Ralph L. Jones, 33 Fed.Cl. at 336 (quoting Electronic & Missile, 189 Ct.Cl. at 257). The court "needs only enough evidence to make a fair and reasonable estimate." Id. (citing Miller Elevator, 30 Fed.Cl. at 702; Electronic & Missile, 189 Ct.Cl. at 257). Modifications Two types of scope determinations in contracts. One is scope of the original contract – meaning, do we have to pay anything for this modification. The second one is whether or not the modification or change is within the scope of the original competition. The first issue comes up when a contractor demands more money (i.e., demand for more money in a CDA claim or REA); the second issue comes up when the Government wishes to modify the contract and the contractor agrees, but another contractor objects to the failure to recompete the contract. Modifications are governed by the changes clause in the contract. However, the question of competitive scope must be determined first to determine if there will be a Competition in Contracting Act (CICA) violation first. As a collateral issue, the question of whether or not the modification is a good deal must be evaluated because any modification is inherently a sole source award to the incumbent contractor. Thus, there is no price competition for the modification. If the acquisition was done under FAR Part 12, Commercial Items, the Government has no ability to demand cost and pricing information from the Contractor to evaluate whether or not the contractor is ripping off the Government with inflated or padded charges. With regard to competitive scope determinations, the GAO in American Air Filter Co., 57 Comp. Gen 567 (B-188408), 78–1, para 443, at 573, stated: "The impact of any modification is in our view to be determined by examining whether the alteration is within the scope of the competition which was initially conducted. Ordinarily, a modification falls within the scope of the procurement provided that it is of a nature which potential offerors would have reasonably anticipated under the changes clause. To determine what potential offerors would have reasonably expected, consideration should be given to the procurement format used, the history of the present and related past procurements, and the nature of the supplies or services sought. A variety of factors