Too sequential?? Linear Rational Model of Planning

In studying the Linear-Rational Model of Planning, a few things stood out immediately. The figure displays a very rigid and controlled sequential process. I believe that it leaves very little room for flexibility and seems restrictive. Learning occurs in many different situations. This figure could include a component which would allow for research and communication between the students and teacher. The teacher must allow for more interactive time. In my opinion, the arrows in the figure should be arranged in more of a circular motion where many other inputs of resources can be examined.