NEC - New Engineering Contracts is a family of contracts invented by Institute of Civil Engineers. The contracts are suitable for procuring a diverse range of works, services and supply, ranging from major framework projects through to minor works and the purchase of supplies and goods.
FIDIC is a French language acronym for Federation Internationale Des Ingenieurs-Conseils, which means the international federation of consulting engineers. It was started in 1913 by the trio of France, Belgium and Switzerland. The United Kingdom joined the Federation in 1949. FIDIC is headquartered in Switzerland and now boasts of membership from over 60 different countries. FIDIC published its first contract, titled The Form of contract for works of Civil Engineering construction, in 1957. As the title indicated, this first contract was aimed at the Civil Engineering sector and it soon became known for the colour of its cover, and thus, The Red Book. It has become the tradition that FIDIC contracts are known in popular parlance by the colour of their cover. This first contract by FIDIC was undertaken jointly with the International federation of Building and Public works. FIDIC's concerted effort at achieving broad consultation and acceptance of its contract forms has seen subsequent editions of its contracts being ratified by the International Federation of Asian and Western Pacific Contractors Association, Associated General Contractors of America and the Inter-American Federation of the Construction Industry, Multilateral Development Banks among others. Because of the broad support it enjoys, FIDIC contracts are the foremost contracts in international construction.
The Joint Contracts Tribunal, also known as the JCT, produces standard forms of contract for construction, guidance notes and other standard documentation for use in the construction industry in the United Kingdom.
From its establishment in 1931, JCT has expanded the number of contributing organisations.
IMechE/IET: Institution of Mechanical Engineers/Institution of Engineering and Technology - two separate institutes that issue jointly agreed model forms covering the design, supply and installation of electrical, electronic and mechanical plant including special conditions for the ancillary development of software.
Reference: CIPS study guide page 142
LO 3, AC 3.1

Normally in a price adjustment agreement, the supplier is allowed to change price based on an indexation, which is published by a third party (for example, government or exchange market). The selected indices often associate with input materials of supplier. For instance, the plastics manufacturer may adjust their price based on crude oil price as oil is major input of producing plastics. Other suppliers may select different set of indices, such as Producer Perception Index.
In this question, only 'Rise in fuel price' could be a justification for supplier to increase price because:
- It may affect the input material price
- The index is checked and published by an independent third party.
Reference: CIPS study guide page 179-184
LO 3, AC 3.3

A verbal contract is generally enforceable in law, provided that it contains all the necessary elements of a valid contract: offer, acceptance, consideration, intention to create legal relations, and capacity. However, certain types of contracts (e.g., for land) may require written form under the Statute of Frauds. Evidence and clarity are the challenges, not enforceability.
Reference:CIPS L4M3 Commercial Contracting Study Guide, Chapter 1, Section 1.1.2 - Types of contracts:
verbal and written.

A contract for window cleaning during the next three months is a short-term service contract in which changes of input costs (labour, tools,...) are very unlikely to happen.
Fixed pricing arrangement is useful for small to medium scope project, with short timelines, where what is delivered can be adequately specified and the likelihood of changes to the specification, scope and input costs is limited.
Reference: CIPS study guide page 172-176
LO 3, AC 3.3

An implied term is a term which the courts imply into a contract because it has not been expressly included by the parties. This may be because the parties did not consider it, did not think that any problem would arise in relation to it or simply omitted to include it.
The courts are very reluctant to imply terms into contracts and will only do so in the following circumstances:
- terms implied under statute
- terms implied under common law
- terms implied because of custom or usage
- terms implied due to previous dealings
- terms implied 'in fact' or to reflect the parties' intentions
Reference:
- Contracts: Express and Implied Terms
- CIPS study guide page 32
LO 1, AC 1.2