Cost disputes Construction sources say the process is characterised by adversarial cost disputes, leading to lengthy arbitration and expensive legal proceedings. As the State prepares to spend more than â¬100 billion as part of Project Ireland 2040, Mr Walsh warned the public works contract wouldnât work for so-called âmega-projectsâ. âThis type of public works contract would not be appropriate for mega-projects like the Metrolink,â he said. Two other types of contract â a New Engineering Contract (NEC) and a so-called âFidicâ contract â would be more appropriate, he said. TII has used these contracts on a trial basis, and the approval process to allow them be considered as an option for infrastructure projects is under consideration, having been supported by the Office of Government Procurement.