models of banknotes recognition into two activities; explaining how is the nature of the blind when they recognize the banknotes value, and demoing how to classify the banknotes through smartphone applications. Therefore, the participants were requested to explain their methodology to recognize banknotes value in the first activity. Then they were asked to demo how to classify the banknotes value via camera application in order to describe usability problems while using it. The interviewed technique was applied to collect data which later was prepared to analyze mental model of participants before designing the prototype. First activity: Explaining, each participant was asked to explain methodology to identify banknotes value by the
questions:
1. How do you identify the banknotes?
2. Do you use the application for banknotes reader?
3. Do you have any experiences or skills of how to use
camera on smartphone?
Second activity: Demoing, how to use camera application
on smartphone. Participants who had installed banknotes reader
or text reader application were pleased to use the application to