EMPLOYER REFUSAL TO BARGAIN IN GOOD FAITH; UNILATERAL CHANGE (FOR NEGOT OF SPECIFIC SUBJECTS, SEE SEC 1000, SCOPE OF REPRESENTATION) – Change in Past Practice

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Employer may not rely on the practice in departments outside of the bargaining unit to establish a binding past practice permitting it to unilaterally implement a negotiable term or condition of employment. What occurs in other departments with other bargaining units is irrelevant to working conditions in the bargaining unit in question. When there is no evidence that the union knew about the use of performance improvement plans in other departments outside of the bargaining unit in question, it cannot be said that this was a mutually accepted past practice.