I’ve been doing this for a while in one-to-one classes, but took me a while to come up with a worksheet for group classes to elicit and practise what students need in the very first lesson, even when those needs are mixed and you knew nothing about them before the class:
Discuss and practise your priorities
Telephoning in English discussion and personalised practice
Telephoning and teleconferences discussion and personalised practice
38 articles and worksheets on needs analysis, a chosen specialist subject of mine, here:
TEFLtastic 