Do you think it is a good idea to strictly follow a lesson plan? 
      
      Why?

A lesson plan is a reminder of what teachers want/need to do and how they want to do it, but keeping in mind that, a productive lesson is not one in which everything goes exactly as planned, but one in which both students and instructor learn from each other.

I think that a planned lesson is just better because it keeps you on track and keeps the students on track. It gives a tangible sense of accomplishment, since it provides opportunities for your learners to take part in extended practice while using the language

It can help guide a fellow teacher in case of a substitution. It enables classes to run more smoothly.

Though a lesson plan should not be a straight jacket, we need to fit in. 

Because there are events and circumstances which we never be ready for, and in that precise moment is where our experience, and improvisation abilities cme in handy.