The invention refers to a system of recording the activities carried out by an individual person during specific time intervals. This system will normally be on an electronic device, but the initial method of recording may be paper-based. This system involves recording activity and associated attributes as a function of time on a grid, using lines to define the activity recorded in each grid interval. The invention is an intuitive data entry system, principally but not exclusively via touchscreen. The system will preferably be deployed on a handheld digital device with touchscreen entry capability. The activity recording system may also record values, attributes or files associated with specific time intervals. It may generate charts, tables, alerts and reminders. It may synchronize with other devices and applications and may import or export data from them.