Question

in your words what is Sellen (2009) Reflecting human values and Marcus (2002) Dare we define user-interface design?

Answer 1

Sellen (2009) Reflecting human values:

• As we know that, the field of Human Computer Interaction (HCI) introduced before more than 25 years ago.
• The main aim of HCI is to understand the interface between computers and humans being.
• As per the Sellen (2009) the HCI have been involving the human values and experience in the digital era of user interface design.
• For example, in modern cars there are many computing devices in engines, but driver interact only with the car and not with the invisible computing devices.
• So that, it requires cognitive science to interface between the human and computing devices which is called as Human Computer Interaction (HCI).

Marcus (2002) Dare concept of user-inter-design:  

• User-interface-design means to provide the facility for communication between human being and an artifact computing device.
• An artifact is any computing device that interface with human being and perform communication in the way of input, interactive activity and output.  
• Marcus upgrade the concept of user-interface-design as Sixth-Sense, using this the interface is nowhere, everywhere, momentarily and anytime depending on the action and movement.
• For example suppose as a human being using his/her eyes can capture any side of pictures. In this it requires the cognitive science that includes the interface between human eyes and computing devices that will help to get the digital pictures.