The utility of diagrammatic presentation of data will be clear from the following points
(i) The impression created by diagrams, lasts much longer than those presented in a tabular form.
(ii) Diagrammatic presentation of data saves much time and labour in comparison to other techniques of presentation of data.
(iii) Diagrams are attractive and have great memorising effect.
(iv) With the help of diagrams, the most complex data become simple and understandable.