Cognitive Scales and Mental Models for Inclusive Design. - Umesh Persad; Patrick Langdon; David Brown; P. John Clarkson (HCI (5), 2007)

Characterising user capabilities to support inclusive design evaluation. - Umesh Persad; Patrick Langdon; P. John Clarkson (Univers. Access Inf. Soc., 2007)

Developing a model of cognitive interaction for analytical inclusive design evaluation. - Patrick Langdon; Umesh Persad; P. John Clarkson (Interact. Comput., 2010)

Investigating the Relationships between User Capabilities and Product Demands for Older and Disabled Users. - Umesh Persad; Patrick Langdon; P. John Clarkson (HCI (5), 2011)