In other world, in real life, a tree is made up of the main stem and the branches. The branches get support or originate from the main stem. In my example, the same situation ensue, B, C, D and E explain more about A. as you go down the tree, it is clear that branch C and E also have branches. Those are referred to as sub-branches. They explain further on A through C and E.
Like I mentioned in the above discussion, this is the most reliable form of diagramming techniques which is easier to explain and understand. The second that I consider my favorite diagramming technique is the dataflow diagram. This example explains how the operation flows from one level to another. The objects that represent data are shown and they obviously relate to the procedure in place. In this case, the diagram is only useful in indicating or rather showing how data flow. It does not require much explanation, in fact if there is any explanation required, it must be very basic.
The diagram I have used as my example is self-explanatory, a step explains more about the previous. The other major advantage of this format is that there are writings on the side of the arrow. the writings explain what happens between the stages.
Lastly on examples, I will talk about my third favorite diagramming technique. The name of the diagramming technique is Data flow graphs. This is a graph which is in other words referred to as directed graph. It consists of some kind of edges. The edges represent the flow of data. It also contain nodes, the nodes represent all operations that goes on in the graph. The diagram below explains.
My response to the question why we should do conceptual analysis of visual images is that it does well in explaining the point deeper. I will use an example of a classroom environment where a teacher, for instance, is lecturing and giving notes to students in titration in Chemistry (this is just an example to explain my point