How many books should you buy for Module One? Thousands. But you can't of course. If you're following a course with a F2F component with us at the British Council in Milan, you'll have access to the DELTA Course Library, but a lot of people won't. So are there books you should buy?
When you start doing the units of the course, you'll find that a lot of the reading can be done on the web. There are now a large number of sites dealing with ELT methodology, as well as facilities like Google Books which supply large chunks of books, if not the whole text, free of charge. We'll be drawing on those sources a lot, and the bulk of the recommended reading will certainly be online.
However, we do recommend that you buy some books, and the following list indicates some of the most useful for each area of the syllabus. We particularly recommend those followed by an asterisk, which will provide general coverage of the main areas of the course. If your budget is limited, go for those first, but don't worry that you won't be able todo the course if you don't buy them all It's not necessary. Of the others, and if your budget stretches to it, give priority to those in areas where you feel you are particularly weak or which focus on areas which particularly interest you. Where you see or this indicates that the book which follows would be a suitable replacement for the one immediately preceding it if you already have access to it at home, in your school library etc. But if you're buying just one, go for the first.
Most of these books will also be useful for Module 2 - there will be relatively few new books to buy for that module.
The link provided for each title will take you to Amazon UK, where you can see a description of the book and/or order it. If you are working on a limited budget, consider buying from them second hand - it will mean you can buy a lot more books than otherwise.
Hedge, Teaching and Learning in the Language Classroom OUP *
Theories of Second Language Acquisition and Learning
Lightbown and Spada, How languages are learned (Third edition) OUP*
or Willis A Framework for Task Based Learning Longman
English as a World Language
Swan Grammar OUP
or Gairns and Redman Working with Words CUP
or Lewis The Lexical Approach LTP
or Edge Mistakes and Corrections Longman
or Bygate Speaking OUP
or McNamara Language Testing OUP