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is the second oldest member of the 1999 FIDIC suite of contracts. Its origins go back to an electrical and mechanical form of contract, the Electrical and Mechanical Yellow Book, first published in 1963. In contracts for electrical and mechanical works much of the design is carried out off‐site and installation carried out by specialist contractors. In this type of contract it makes more sense for the contractor rather than the employer to be primarily responsible for design. The 1963 Yellow Book was therefore a contractor‐design form of contract under which the Contractor and not the Employer was responsible for all or most of the design.

      The Yellow Book underwent various editions, culminating in the third edition in 1987, the same year as the fourth edition of the FIDIC Red Book. When preparing the 1999 Yellow Book the task group mainly had regard to the 1987 version of the Yellow Book, and also to another form, first published in 1995, called Conditions of Contract for Design‐Build and Turnkey; this was known as the Orange Book.

      The 1999 Yellow Book replaced both the Yellow Book 1987 and the 1995 Orange Book. Whereas the 1987 Yellow Book dealt only with electrical and mechanical works, the 1999 Yellow Book covered any building and engineering works designed by the Contractor, reflecting the wider scope of the Orange Book.

       Contractor design

      The first feature to note about the 1999 Yellow Book, distinguishing it from the Red, is, therefore, that it is a contractor‐design form of contract; under the form, the Contractor is responsible for all or most of the design.

      This is also the case with the 2017 edition, the title of both editions being the same: Conditions of Contract for Plant and Design‐Build, for Mechanical and Electrical Plant and for Building and Engineering works designed by the Contractor.

       Fixed price lump sum

      The second important feature of both editions of the Yellow Book, which also distinguishes it from the Red Book forms, is that it is a fixed price lump sum rather than a re‐measurement contract. The Contractor's basic entitlement is to be paid a fixed price, stated in the Contract at the outset and expressed as a lump sum, subject only to adjustments or additions made pursuant to the terms of the Contract for such matters as variations or unforeseeable physical conditions.

       The Engineer

      The third main feature of the Yellow Book in both editions is that, like the Red Book forms, an important role is assigned to the Engineer, who performs the same functions under both Books and in the 2017 edition must also act neutrally.

       Risk allocation

      The fourth feature of the Yellow Book in both editions is that, also like the Red Book forms, it seeks to strike a fair balance of risk between Contractor and Employer. Many of the circumstances in which the Contractor can claim in the Red Book (for example, where unforeseeable physical difficulties are encountered) are also circumstances in which he can claim in the Yellow Book.

      1.2.3 The 1999 Silver Book

      Unlike the other two Books in the rainbow suite, the Silver Book 1999 was a completely new form of contract. It was introduced to meet a perceived market need for a form of contract which would give project sponsors maximum certainty as to time and budget. This need was particularly evident in Build‐Operate‐Transfer and other concession‐type projects, in which the project financing placed huge constraints on sponsors to ensure that the project was completed on time and within budget. The fair or even‐handed allocation of risk characteristic of the Yellow and Red Books was wholly unsuited to such projects. What the sponsors required was a contract form under which the contractor carried virtually all the risk and had very limited opportunities to claim.

      The title of the Silver Book in both editions is Conditions of Contract for EPC/Turnkey Projects. ‘EPC’ stands for Engineer‐Procure‐Construct, and indicates the range of the Contractor's responsibilities under the Contract; the Contractor is responsible for engineering design, the full range of procurement and for construction. The Contractor designs to Employer's Requirements, which in some cases amount to little more than a performance specification although they may contain considerable engineering design.

      The word ‘Turnkey’ is used synonymously with ‘EPC’ in the title of the Silver Book forms to signify that the Contractor is to provide the Employer with a complete package, so that he has the plant or other facility ‘at the turn of a key’. The Employer thus has a single point of responsibility for design, procurement and construction.

      The project sponsors are provided with much greater certainty about time and cost than would be available under a Yellow Book Contract; under the form, the Contractor agrees a lump sum fixed price and has very limited scope for claiming additional time or money. The Contractor is forced correspondingly to price for risk, and therefore a Silver Book Contract can result in considerably higher project costs for the sponsors. Silver Book contracting has sometimes been called a Rolls Royce method of procurement for that reason.

      FIDIC itself counsels caution when contractors are invited to tender on the basis of a Silver Book form. The guidance is to the effect that contractors ought not to contemplate contracting on such a basis unless they have had an opportunity to assess all relevant risks; something which it is difficult in practice to achieve when the tender period and available resources are limited. What often happens in practice, although this will depend on the individual contractor's bargaining power, is that the parties will negotiate exceptions to the contractor's otherwise comprehensive responsibility and, for example, identify particular items of design or information for which the contractor will not be responsible or carry the risk. Even when such exceptions might be carved out, a responsible contractor will need to exercise extreme care before deciding to contract on a Silver Book basis and will almost always have to build into the price a significant cushion against remaining risk.

      There is no Engineer in the Silver Book forms, the Employer in the 1999 edition being able to administer the Contract himself, although typically he will appoint an Employer's Representative to do so on his behalf. Whether or not such a representative is appointed, any determinations made must in the 1999 Silver Book be fair, in accordance with the Contract and take account of all relevant circumstances.

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