title: An attempt to quantify some factors that affect the operational effectiveness of a system.
abstract: An attempt has been made to assess the effects of various factors which cause the operational performance of a system to be degraded. These include environmental factors and, in the case of military systems, the effects of battle which affect not only the hardware but also the human operator who forms an important, but often weak, link in any system.
authors.affiliation: Flight Systems (Farnborough) Department, The Royal Aircraft Establishment, Farnborough, Hants, UK.
authors.forename: E J
authors.initials: EJ
authors.lastname: Lovesey