This text, first published in 1984, examines the process of building suitable collections for sci-tech libraries. Sci-tech collections are not the easiest to develop successfully in view of the complexity of the subjects involved, the large number of choices to make, and the difficulty of even knowing about certain grey area publications, such as meetings proceedings, government documents and technical reports. Expert writers assess these difficulties and provide a guide to solutions to the problems inherent in building these collections.