Drawing/illustrations help the students to visualise concepts, ideas etc. Which are abstract. It also helps in providing information and explaining experimental set-ups and theories so that the student is able to grasp the matter easily. For example, the distribution of electrons, the microscopic diagram of a cell, skin etc. Diagrams help understanding the principles, experimental procedures. The textbooks illustrations lack certain qualities which create problems for the students at their level to tackle. For example, an object say a clamp is represented in many ways which tend to create confusion in the students mind. Misinterpretation is also possible in such cases. The skill of the students at their respective age groups have to be considered, keeping in mind that the diagrams has to be reproduced by him/her. The students medium of representations is pencil. It becomes really a difficult task for the student to reproduce certain diagrams as they have thick and thin lines, varied perspectives, differences in shading etc.