The dissimilarity between principal contractor and contractor organisations under CDM 2007 can often be over measured. In an effort to clearly distinguish the two, so as to understand the role of principal contractor as part of an on-going study, inevitable gaps emerge which invite further research into practice and procedure. Based on a desk research and three (3) focus group meetings with industry experts, it is established through a qualitative inquiry that the principal contractor contributes considerably to the successful implementation of CDM regulations during and after the construction phase. Crucial to this process are the legal and contractual obligations stipulating health and safety requirements before and during the construction phase - regulation 23 (1) (a). In order to successfully deliver the construction phase plan, critical to this process yet underestimated are key procedures such as appointment criteria, performance measurement and liability for instance which are hardly mentioned in the CDM 2007 or the practice guidance notes. Clearly, contractors are bound to coordinate numerous activities on construction sites let alone managing health, safety and welfare of employees in accordance with section two (2) of the Health and Safety at Work Act (HASAWA)1974 and part 4 of the CDM 2007 - duties relating to health and safety on construction sites. Providing explicit terms of engagement and carefully executed procedures such as appointments can enhance overall health and safety management through construction phase plans. The conclusions of the study therefore suggest further areas of research alluded to above consistent with the literature review and regulation 4 (1) (b), 5(1)(2), 6 and 22-24.