Opponents argue that the PLA have several drawbacks. They argue that LTOs increase construction costs. Uns analysed contractors may not propose projects under a collective agreement or, if they offer, do not win contracts on the basis of lower costs. If they are forced to hire workers through a union hiring room, contractors may not be able to use their own labour. Workers of a non-union contractor may be required to join a trade union and pay trade union fees. If a contractor is required to contribute to a union retirement plan, staff may not be in the project long enough to support the plan. Opponents of the PLA also argue that independent union contractors can implement more effective workplace training programs and that the evidence does not suggest that independent construction projects of trade unions are less secure than trade union policy projects. Finally, opponents argue that federal and regional authorities enforce occupational health and safety laws. A PLA usually includes labour dispute resolution procedures. For example, if there is a disagreement between management and unions over the interpretation of the ALP, the dispute may go to mediation and then conciliation. THE AEPs generally contain a provision that unions do not agree on a strike and contractors agree not to block workers. Qualitative research has been conducted on other aspects of ATPs. For example, a group of researchers interviewed about 40 people with PTAs to identify the pros and cons of agreements.
The results of such a small sample may not be representative of all LSAs. Nevertheless, the researchers concluded that „the interviewees seemed the most convinced that the main advantage of a PLA was to ensure the completion of a project in a timely manner. Pl`s, in particular, guarantee a continuous influx of skilled workers. 25 One respondent said, „Anything that goes beyond five to eight million dollars, we will go into a project employment contract because we think it is a more effective management tool…. Basically, it`s the work pool, the labour supply and the quality of the processing. However, respondents also criticized PTPAs. The main criticism was that THE AEPs can increase the bargaining power of construction unions. According to the study, construction unions can make higher demands in areas where a large proportion of jobs are covered by the PLA in negotiations on new union contracts. If one union is successful, other unions may make similar requirements.26 It may also be difficult to determine the economic impact of ALP when contractors use ALP because of the benefits that LBTs can offer.