“Neither party is obligated to yield with respect to mandatory matters, which are defined by Section 8(d) of the National Labor Relations Act as "wages, hours and other terms and working conditions” (Sherman, 1990, p.3). National Labor Relations Act. These mandatory features are not negotiable and must not be omitted from the collective bargaining entity of any style or design deals with plant or machinery upgrades that involve automation or equipment carrying out the work of a union member who would normally carry out the task manually. This aspect of the operation will lead union members to oppose the introduction of new work assignment changes based on mechanical equipment that will replace their current work assignment. In this regard it is clear that the unions have a very clear objection because they do not want to be replaced by a piece of equipment. Where companies seek to improve productivity, to do so they rely on equipment that will perform more efficiently than current human activity. These opportunities that the company management is trying to implement must take into account existing union contracts and, to this end, follow the collective agreement in force. Additionally, the author of the article “Collective Bargaining on Work Assignment Proposals: Differentiating Between Jurisdiction and Unitary Scope Concepts” goes on to explain the regulation surrounding collective bargaining agreements as they impact the union workforce. “Therefore, an employer cannot change the composition