# Overview

Collaborative Sketching, also known as C-Sketch or 5-1-3 G, is a method for concept generation in which several designers each sketch a design concept then pass their sketch to another designer to modify. Developed by Shah, collaborative sketching originated as a modification to Method 6-3-5. A key difference between collaborative sketching and Method 6-3-5 is that designers only work on one design at a time, whereas in Method 6-3-5, designers work on three designs concurrently.

# Protocol

Collaborative sketching has two basic variables: the number *n* of designers in the loop and the time *t* allocated for each iteration *i*. The number of iterations equals the number of designers. Therefore, a design team using C-Sketch will produce *n* designs. The two constraints in this method are (1) sketching is the only mode of communication between designers and (2) a designer cannot fully erase the sketch of another designer.

The basic protocol for C-Sketch is the following:

- The design team reviews the design objectives and chooses a facilitator to keep track of iteration time.
- The facilitator begins the first design iteration and each designer sketches a concept to meet the design objectives. This is the first design iteration.
- After
*t*minutes are up, the facilitator instructs the designers to pass their sketch to the left or right. Designer*j*passes their sketch to designer*j*+ 1, and designer*n*passes their sketch to designer 1. - Each designer then adds, subtracts, or otherwise modifies the sketch passed to them for
*t*minutes. This is the second design iteration. - Steps 3 and 4 are repeated for
*n*– 2 more iterations.