Industrialised Building Systems (IBS) is typically used interchangeably with other terms such as prefabrication, offsite manufacturing, offsite construction, and modern method of construction (MMC), industrialised building and industrialised construction. Nevertheless, the term modern method of construction (MMC) has been used to collectively describe both offsite-based construction technologies and innovative onsite technologies in the United Kingdom. It is evident that there exist a wide range of contextual issues which stems from the definition of these terminologies. However, lack of previous research has explored the relationship between these terminologies. Therefore, this paper emphasises the contrasting concepts of IBS and MMC, and concludes that ill-defining the MMC-IBS terms leads to misunderstanding, uncertainty and prejudice of the IBS concept and its benefits besides the adoption of IBS in global, which will be detrimental to efforts promoting the use of IBS in the construction industry.
