As used in this Act, unless the context otherwise requires:
"Employee benefit plan" shall mean an employee benefit plan as defined under the Employee Retirement Income Security Act, 29 U.S.C. 1001, et seq.
"Temporary or short-term employee" shall mean an employee who is not covered by a collective bargaining agreement or an employment contract.
"Written agreement" shall mean a participation agreement or other agreement prescribed by the employee benefit plan or labor organization but shall not be construed as a collective bargaining agreement, except as permitted under the Illinois Public Labor Relations Act.
820 ILCS 190/15