The diagram gives a visual illustration of Vertical Thinking. Imagine the highway representing the solution process ( i.e. vertical thinking ) leading towards the solution ( Solution City ). As you know it is easy to speed along a highway and one soon reaches the destination. This vertical thinking is a good process.

BUT

What can often happen on a highway - a traffic jam. When one is in a traffic jam one stops ( i.e. you are stuck ) How do you progress.? One can sit and wait . One can try and force ones way through.

This illustrates one of the problems of vertical thinking that when the process breaks down, there is nothing to put in its place.

We will return to this diagram later