Great book for:

adult learners working in technical jobs in an international context.

in-work learners who are technicians, engineers, supervisors, or team leaders.

people who need to communicate with co-workers (frequently also non-native users of English) about very practical technical subjects - installations, working practices, processes, problems, etc.

people who need to communicate by e-mail, make telephone calls, and read and understand manuals written in English.