There is a long history of research that the author would benefit from reviewing and citing, e.g. this article from 1995: "Why Looking Isn't Always Seeing: Read

There is a long history of research that the author would benefit from reviewing and citing, e.g. this article from 1995: "Why Looking Isn't Always Seeing: Readership Skills and Graphical Programming" http://www.cs.toronto.edu/~chechik/courses18/csc2125/paper12.pdf http://www.cs.toronto.edu/~chechik/courses18/csc2125/paper12...