Life-logs are personal e-memories that use sensors to give contextual information. Mobile phones are ideal for this type of data collection as they are constantly with the individuals who own them.

This paper proposes a framework for a life-log application implemented on a mobile phone. The five basic design requirements are: seamless integration into daily life, resource efficiency (for example, battery charge), security, long-term digital preservation, and information retrieval. The proposed application runs on the Android platform. Much of the paper describes the components for data sensing and collection. The framework allows the user to choose the sensors. The information is stored in standard form, regardless of which type of sensor is used.

Part of the standard form involves annotations, or data about the data. Google Calendar is an example of software that creates annotation information. Security is, of course, a major issue in the design of a life-log. When data in the life-log is being transmitted, as to a large server, it needs to be encrypted.

Six users evaluated the framework over a nine-month period. One result of the evaluation was data on battery life. The time it took a battery to lose 80 percent of its charge ranged from 21 to 6.5 hours, depending upon how many sensors were on. It is difficult to judge how effective the device is this early in its life.

The design presented here seems valid and instructive for someone designing a similar framework. However, the presentation is marred by grammatical errors.