To amend title 5, United States Code, to extend the probationary period applicable to appointments in the civil service, and for other purposes.

Requires the probationary period before an appointment in the competitive civil service or an inital appointment as a supervisor or manager becomes final to be not less than two years.  Retains existing probationary requirements for preference eligible individuals (i.e., veterans) initially appointed to positions that exist 180 days after the enactment of this Act.

Requires the head of each agency to ensure that: (1) announcements of vacant positions and offers of appointment clearly state the terms and conditions of the probationary period, (2) individuals who are required to complete probationary periods receive timely notice of performance requirements, and (3) certification of successful completion of a probationary period is made.

Revises the definition of "employee" for purposes of adverse action provisions to mean: (1) an individual who has completed not less than two years (currently, one year) of competitive federal service, or (2) an member of the excepted service who has completed not less than two years of current continuous service in the same or a similar position in an executive agency.