Difference between Isometric, Oblique and Orthographic Drawing ( Sue Lun )

Isometric Drawing- It is a method of visually representing three dimension objects in a two dimension form. The scale along each axis of the projection is the same. This form of art is commonly used in technical and engineering drawings.

Oblique Drawing - Also known as oblique projection, this simple form of drawing is produced by making use of parallel lines. These lines would project an image by intersecting parallel rays. It is unsuitable for formal,working drawings. However, it is commonly used in furniture illustrations.

Orthographic Drawing- This form of drawing is categorised into two parts-(a) multiview orthographic projection and (b) axonometric pictorials. The latter shows an image of an object viewed from a skew and crooked direction, and is often used to approximate graphical perspective projections. Multiview orthographic projection provides up to six views of an object, and gives enough information to make a 3-D object.

Cited from: wikipedia.org