This part of the Essentials site provides general information on the theory of second language acquisition and methods of second language teaching.

We believe that the best language teachers connect what they do in the classroom with a coherent, evidence-based understanding of how people learn second or additional languages. This material helps you as a teacher make those connections.

There are five Principles sections:

Several of the sections include teacher self-assessment worksheets that you can download for analysis of your individual teaching style.