1- Give the Chatty Cathy verbal jobs in the classroom.  Let them know you see that they have a gift and you have faith that they will use it in constructive ways during classtime.  It could be their job to introduce new students, make announcements, and to draw out students who don\'t talk very often.
2- Set up a signal with the student.  You might agree to pull on your ear or put your hand on your heart when they are talking so much that it is interfering with the needs of the situation.  This is effective only when the students agrees in advance that a signal will be helpful to them.
3-If you notice the student talking at an inappropriate time, wait, and watch before jumping in.  Students will often stop yakking when they notice you are waiting patiently.  It is even more effective if you explain to the class in advance that you intend to stop lessons until all students\' attention is focused.
4-  Initiate a discussion saying Chatty Cathy and Carl that i am noticed at both expermente and math that day you had not heard the instructions you gave.  Ask what, why and how questions to help them recognize the way their talking interferes with their ability to follow along with the class.   \"What happens when you miss instructions?  What causes this to happen? How does it affect the teacher and other students?  What ideas do you have for solutions?\"  This shifts responsibility for this behavior to them.
5- Emotional honesty helps.  Remember to use the \"I feel _____when________  and I wish___________\" formula.  In the case of a talkative student it might sound like this;  \"I feel frustrated when I repeat directions several times and I wish that I only had to give them once.\" (Notice that this example does not include a \"you\" statement.)  Keep the focus on your needs and observations and not in how to change or control the student\'s behavior