This is a structured way of generating new ideas where headings are arranged into columns and options are added under the headings to populate each row.
The user can then choose an option from each row to inspire their design.
This can often help designers to overcome a block and inspire ideas they may not have thought of before.
Process - Key Stages
Planning - analysis of problem/product, identify factors that will be/are important to solving the problem or improving the product, generate a range of different options for each factor, produce a matrix
Using - randomly or systematically select an option from each factor to produce different alternatives
Summary - disregard weakest ideas, and identify most promising ideas