| Summary: | As people age memory capabilities are reduced, thus reminder system can benefit older adult users. However, the uptake of reminder system is still low. In our previous work, we proposed a mental model of older adults for a reminder system. We presented this model using design principles: simplicity, flexibility, recognizability and familiarity. However, in this research, we were only interested to investigate the simplicity element of the user model. To do this, we evaluated two reminder applications - Calendar and Task which were chosen based on other design principles: flexibility and familiarity. We had six older adult users who evaluated the interfaces based on usability principles: ease of use, ease of learning and user friendliness. The results showed that none of the reminders were considered as easy to use thus classified as unfriendly. What we learned from our study was that older adults only considered 'easy-to-use' if the interfaces were perceived simple enough for them and producing simple design requires a hard work and is a time-consuming process.
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