Teaching Speaking

       If you have learned a language other than your own, which of the four skills-listening, speaking, reading, or writing-did you find to be the hardest? Many people feel that speaking in a new language is harder than reading, writing, or listening for two reasons. First, unlike reading or writing, speaking happens in real time: usually the person you are talking to is waiting for you to speak right then. Second, when you speak, you cannot edit and revise what you wish to say, as you can if you are writing.
     In language teaching, the four skills are described in terms of their direc￾tion. Language generated by the learner (in speech or writing) is referred to as productive. Language directed at the learner (in reading or listening) is called receptive. Another important idea is the channel, which refers to the medium o f the message (aural/oral or written). Thus, speaking is the productive aural/oral skill. It consists of producing systematic verbal utterances to convey meaning.
      Teaching speaking is sometimes considered a simple process. Commercial language schools around the world hire people with no training to teach conversation. Although speaking is totally natural, speaking in a language other than our own is anything but simple.
Spoken language and written language differ in many significant ways.

References
David nunan.singapore 1991.practical english language teaching:reading.