Is there a setting that handles this...? Float using Mandatory = 30 for example, but if using "On or before" exact same date sais 0 instead of the 30 days - why? should be 30 also...I used P3 longer than P6 but if I add a finish on or before Constraint for 30 days after the showing completion date shouldn't that give me 30 days float? (I know it would in p3) I don't like using the mandatory date and have generally read that using the Project "Must Finish By" constraint in never a good idea - even though it fixes this issue...at least my interpretation of Ron Winter SA software... - this is on P6 Ver 8.3 P6E version - if feel a setting perhaps was changed...