Sometimes you need to follow actual work closely. For example, you may have an especially tight deadline that you need to keep close track of. To track actual work on a daily basis, you can use the timephased fields in the Resource Usage view. Because you can enter information for a particular day in your schedule, timephased fields let you to keep your project up-to-date daily or weekly. You can use a view with timephased fields much the same way you use a timesheet.
To update actual work on a daily basis
.
If you want to enter actual data for your project over time and keep track of your project from day to day, you can use the timephased actual work and actual cost fields on the Task Usage and Resource Usage views.