The nature of project complexity within construction engineering projects has been the subject of study with growing interest, especially since the Engineering and Physical Sciences Research Council (EPSRC) NetworksEngineering and Physical Sciences Research Council was set-up in 2003. Yet, it could be argued in research terms, that project complexity has been neglected both in terms of conceptualising it and in terms of empirical study. Given the supposed severity of project complexity and the obvious failings of the industry's approach towards project delivery, it is reasonable to assume that such an issue would provide a focus for research to improve practice. The main issues appraised are structural complexity, uncertainty, organisational complexity and technological complexity. As established from the reviewed literature, one of the hindrances to project performance within the construction industry is project complexity, which mainly emerges during the construction and design process.