The majority of the research studies published in LCJ was conducted in western countries, especially in the USA, the UK, and Sweden. In developing countries, Lean Construction research showed less progress. There is a definite need to motivate developing countries to start conducting more research on this topic and applying lean principles in the construction industry. The need to eliminate waste and increase productivity in such countries is much more than the ones in developed countries. The motivation for this study arose from our wish to change this situation in developing countries by promoting lean construction research by showing research gaps and popular areas. For example, The Last Planner System (LPS), Contractual Issues and Relational Contracts, and Integrated Project Delivery (IPD) is the most popular three areas of research. On the other hand, there are many less published areas such as Target Value Design (TVD) and Lean Construction Delivery. The fewness in the number of research on these areas can be a guide for new researchers that are planning to start conducting studies in the lean construction field. Lean Construction Journal perceived as the locomotive of the Lean Construction research for years, and there is more need than ever to promote Lean Construction in the industry.