Employees
EmployeeID
LastName
FirstName
<other bio data>
Tasks
TaskID
TaskDescription
Activities
EmployeeID << link to Employees, who's doing a task
TaskID << link to Tasks, what they were doing
StartTime << date & time activity started
EndTime << date & time the stopped
You can create Reports grouping by any timespan you wish, and use the
DateDiff() function to calculate how many hours were spent on each
task.