Frederick Harrison was Managing Director of Leavor Harrison Associates and formerly Director of Operations, Building and Works, Glasgow Corporation. He has worked as a site agent, project engineer and project manager in a variety of industries and has also written and lectured widely on various aspects of project management. Dennis Lock is a busy freelance writer and university lecturer who specializes in project management. His previous exceptionally wide experience has included subminiature electronics, defence systems, heavy engineering and international mining, along with a progression of successful management positions. He has written or edited numerous books and handbooks (25 of them for Gower) over a writing career spanning 35 years.