The Reflective Teacher

Reflective teaching means looking at what you do in the classroom, thinking about why you do it, and thinking about if it works - a process of self-observation and self-evaluation. By collecting information about what goes on in our classroom, and by analysing and evaluating this information, we identify and explore our own practices and underlying beliefs. This may then lead to changes and improvements in our teaching. 

Why it is important
Many teachers already think about their teaching and talk to colleagues about it too. You might think or tell someone that "My lesson went well" or "My students didn't seem to understand" or "My students were so badly behaved today."
However, without more time spent focusing on or discussing what has happened, we may tend to jump to conclusions about why things are happening. We may only notice reactions of the louder students. Reflective teaching therefore implies a more systematic process of collecting, recording and analysing our thoughts and observations, as well as those of our students, and then going on to making changes.
If a lesson went well we can describe it and think about why it was successful.
If the students didn't understand a language point we introduced we need to think about what we did and why it may have been unclear.
If students are misbehaving - what were they doing, when and why?
Once you have some information recorded about what goes on in your classroom, what do you do?

Think
You may have noticed patterns occurring in your teaching through your observation. You may also have noticed things that you were previously unaware of. You may have been surprised by some of your students' feedback. You may already have ideas for changes to implement.

Talk
Just by talking about what you have discovered - to a supportive colleague or even a friend - you may be able to come up with some ideas for how to do things differently.
If you have colleagues who also wish to develop their teaching using reflection as a tool, you can meet to discuss issues. Discussion can be based around scenarios from your own classes.
Using a list of statements about teaching beliefs (for example, pairwork is a valuable activity in the language class or lexis is more important than grammar) you can discuss which ones you agree or disagree with, and which ones are reflected in your own teaching giving evidence from your self-observation.

Read
You may decide that you need to find out more about a certain area. There are plenty of websites for teachers of English now where you can find useful teaching ideas, or more academic articles. There are also magazines for teachers where you can find articles on a wide range of topics. Or if you have access to a library or bookshop, there are plenty of books for English language teachers.

Ask
Pose questions to websites or magazines to get ideas from other teachers. Or if you have a local teachers' association or other opportunities for in-service training, ask for a session on an area that interests you.

Source: http://www.teachingenglish.org.uk/articles/reflective-teaching-exploring-our-own-classroom-practice