Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. Toolkits for user innovation have been implemented in a few advanced fields such as custom integrated circuitry with good customer acceptance. When compared to custom designs created by manufacturer-based designers, designs created by users with the aid of toolkits are likely to be developed more quickly, and are also likely to provide a better fit to user needs.