Abstract: An activity entry apparatus for making activity entries onto pre-established time log activity forms is disclosed. The apparatus comprises a time log form overlay sheet of resilient and significantly transparent material having a series of writing instrument guides extending therethrough. The guides define a series of activity change segments having lengths at least great enough to extend from one time log form activity section to a directly adjacent time log form activity section. At least one such activity change segment has a length great enough to extend from and between activity sections on the time log form which are separated furthest from one another. The guides also define time interval segments which extend from the activity change segments. The time interval segments have lengths which are equal to predetermined distances between log form time indicator lines which represent selected intervals of time during the pre-established time period for a given activity on the time log form.