Factors which influence energy use are listed, together with procedures enabling the relationship between energy use, internal and external environment and capital and running costs to be explored and evaluated. A calculation method for estimating energy use and costs is included. To be read in conjunction with BS 5250:1989,BS 5925:1991,BS 6232,BS 6676,BS 8208Cross References:BS 3533BS 5250BS 5422BS 5617BS 5618BS 5720BS 5803:Part 1BS 5803:Part 2BS 5803:Part 3BS 5803:Part 4BS 5803:Part 5BS 5925BS 6232:Part 1BS 6232:Part 2BS 6676:Part 1BS 6676:Part 2BS 8207BS 8208:Part 1BS 8208:Part 2DD 93