By Krasnov N.F.

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For the specifier, the decision to specify using prescriptive and/or performance methods cannot be separated from the type of contract used. There are two principle users of the written specification on-site, the contractor’s site agent and the clerk of works (and/or contract administrator). The written specification is not read frequently enough by site operatives; nor is it understood sufficiently, a situation exacerbated by the use of temporary operatives. Operatives will rely, for the most part, entirely on drawings and tend not to look at the written specification unless ordered to do so by the contractor’s agent.

Design and build contracts) and for sub-systems (especially building services and prefabricated building systems). One of the main challenges for the designer is deciding on the level of performance required: too narrow, and the tender is given little latitude; too wide, and the scope becomes too great to make sensible comparisons from the solutions presented by competing contractors. Care is needed to establish levels of performance that suit the project and the client. Performance specifications tend to be used by client organisations keen to leave the choice open (in the hope of getting the same performance cheaper than if a proprietary product was used).

However, more research is needed to substantiate such a link. External influences There are a number of external factors that are under the control (to a lesser or greater extent) of persons/organisations located outside the specifier’s office that will influence the specification process. This includes factors under the control of the manufacturer and others. The former are the cost of using the product, the availability for delivery to site on programme, associated services provided and the quality of the product information.

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Aerodynamics part 1 by Krasnov N.F.
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