The ACA Period is populated by UBACA only when a Look-Back measurement period is selected for the employee. The options are: \\ \\
__Administration Period__.  For ongoing employees, this is the period following the end of the measurement period and ending immediately before the stability period. \\ \\
__Initial Period__.  For new hires, starting on the fourth full calendar month to the end of the Lookback month. \\ \\
__Non Assessment Period__.  For new hires, their first partial month and the first three full calendar months. \\ \\
__Stability Period__.  A full time employee is put into a stability period for the duration of one year, based upon the date that is stamped on IEEI.  To remove an employee from a stability period, remove this date.  When an employee is in a stability period, no computations are made to hours worked or wages, as the previous month’s values will be used.  NOTE:  After completing the previous year for a Look-Back category, this date will be used going forward. \\ \\

__Standard Measurement Period__. A period defined by the employer of at least three consecutive months, but not more than 12 consecutive months, used as a part of the Look Back measurement period.
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![Notes|Edit:Internal.ACA_PERIOD] 	
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