The practice of concluding framework agreements arose in the 1950s with an asylum agreement between Colombia and Peru.  In general, no. The maximum authorised duration of a framework agreement shall be four years, except in exceptional cases. Typically, these circumstances would be about the same level as the investments required to participate in the framework (e.g. B in special equipment), which means that suppliers could only recoup this investment for a period of more than four years. In the context of procurement, a framework agreement is an agreement between one or more undertakings or organisations `the purpose of which is to define the conditions applicable to contracts to be awarded during a given period, in particular as regards the price and, where appropriate, the quantity provided`.  The Heads of Terms provided that the agreement would cover a fixed period of 3 years, after which a review meeting would be held to renegotiate or set the terms of the agreement. With respect to THE CPCs, the Heads of Terms presented the following: G was instructed, under a series of agreements with E, to visit households that source gas and electricity from major energy suppliers in order to convince them to switch to the defendant. . .