Freehand drawing enables visualization of an idea in the form of a sketch. It is also a universal language designers use to communicate with other participants of a project. That is why freehand drawing ought to be an inherent element of a design process, especially in the first conceptual phase.

Following principles should be followed for free hand sketching:

- The object should be examined in detail as well as its goals and concepts should be considered.

- The selection of a view is based on a more specific aspect.

- The sizes of views are used to specify space on a drawing sheet.

- Dim lines are drawn so that extra lines may be erased easily.

- Although the ratio and proportion of distinct sections of an object are examined, neither scale or ruler are utilized in drawing.

- Firstly, horizontal lines are drawn then vertical lines are drawn, and arcs and circles are drawn lastly.

- After completing the diagram, a clear scale is written in some suitable manner.