For me the Planned Start and Planned Finish fields (and Original Duration) are nothing but a nuisance. I have to constantly run a global change to overwrite them with the Start and Finish fields in order to use Apply Actuals or Update Progress without mucking up any changes Ive made. I understand how to avoid making my life difficult with these fields, but I dont understand how to make my life easier: whats the point of having them? I have a baseline to compare the current schedule against, so why have this intermediate fake baseline? And even if it were a good idea to have an intermediate baseline, WHY ON EARTH DOES IT OVERWRITE MY SCHEDULE WHEN I RUN APPLY ACTUALS? Primavera is written by a great team so Im sure they had something in mind...