'Recognizing the need is the primary condition for design.'

• Sketching is the creation of graphic images that are approximate graphic representations or models.

• Freehand sketching is manual sketching with the minimum of tools such as paper and pencil. 

However, the drawing needs of today have changed dramatically due to the availability of
computers. Traditional design and drafting has largely given way to computer design drafting but design sketches will always be needed.
 
Sketches are helpful in capturing design ideas and trying out different solutions in a fast and inexpensive way. Technical sketching is used as aid in conceptualization, spatial visualization and translating imagination into visual models.

Freehand sketching is an economic and effective means of formulating alternate solutions to a given problem so that a choice can be made on the best solution.

Initial design studies are usually done with freehand sketches because accurate and detailed drawing of design options is expensive and time wasting at the initial stages of a project. 
 

• Basic sketching is conceived to be of two types, namely rough sketching and refined sketching.

• Rough sketching is the art of using freehand to create graphic images. Refined sketching creates graphic images with the aid of basic instruments. The CAD computer can be used to create refined sketches. 

 
Rough Sketching Tools
Rough or freehand sketching tools are quite few and require minimum investment. They are: pencil, paper, eraser, and pencil sharpener.

Questions

Name all three types of sketching

3 points

Name two common 3D views used in drawing

2 points

Explain the main differences between freehand sketching and constructional drawing

5 points

Sketch a circle using construction technique

10 points