In recent years there has been an increasing interest in maturity models in managementrelated disciplines; which reflects a growing recognition that becoming more mature and having a model to guide the route to maturity can help organisations in managing major transformational change. Lean Construction (LC) is an increasingly important improvement approach that organisations seek to embed. This study explores how to apply the maturity models to LC. Hence the attitudes, opinions and experiences of key industry informants with high levels of knowledge of LC were investigated. To achieve this, a review of maturity models was conducted, and data for the analysis was collected through a sequential process involving three methods. First a group interview with seven key informants. Second a follow up discussion with the same individuals to investigate some of the issues raised in more depth. Third an online discussion held via LinkedIn in which members shared their views on some of the results. Overall, we found that there is a lack of common understanding as to what maturity means in LC, though there is general agreement that the concept of maturity is a suitable one to reflect the path of evolution for LC within organisations.

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In recent years there has been an increasing interest in maturity models in managementrelated disciplines; which reflects a growing recognition that becoming more mature and having a model to guide the route to maturity can help organisations in managing major transformational change. Lean Construction (LC) is an increasingly important improvement approach that organisations seek to embed. This study explores how to apply the maturity models to LC. Hence the attitudes, opinions and experiences of key industry informants with high levels of knowledge of LC were investigated. To achieve this, a review of maturity models was conducted, and data for the analysis was collected through a sequential process involving three methods. First a group interview with seven key informants. Second a follow up discussion with the same individuals to investigate some of the issues raised in more depth. Third an online discussion held via LinkedIn in which members shared their views on some of the results. Overall, we found that there is a lack of common understanding as to what maturity means in LC, though there is general agreement that the concept of maturity is a suitable one to reflect the path of evolution for LC within organisations.

The application of the Last Planner System (LPS)in the construction industry is increasing more and more. Reviews in the literature report that by applying LPS project performance is improving. However practical experience shows that there is some lack of structure in daily work. Further more researchers are still looking for feasible process measurement.This paper aims to contribute to the described challenge by developing a concept for the combined application of the two following methods. One is Earned Value Management (EVM), a project control method that combines data regarding scope, schedule, and resources to assess project performance and progress. The other one is LPS, a Lean Construction method for production planning and control. In LPS project workflow is developed and controlled collaboratively within a team. Through the combined application of these two methods based on the structure and a transparent production plan the project's workflow can be measured by objective metrics like Percent Plan Complete (PPC), Schedule Variance (SV) and Cost Variance (CV) to highlight the need for potentially necessary corrective action. KEYWORDSLean construction, last planner system, earned value management, process measurement, work structuring.

The purpose of methods and tools is to serve the project team and add value within the project delivery. Therefore, the implemented production system should support the interaction of the project team, enabling team members to develop a common understanding, and to reach the required quality and production performance when carrying out their daily activities. This research concludes that the Last Planner ® System (LPS) aligns to the Toyota Production System (TPS) and its recognized management theory, which is a vehicle to integrate the minds + hands philosophy within projects from early design phase till handover. Our findings show that adopting the LPS as a production system helps to align and integrate the project participants. Takt is a work structuring tool that can be integrated into the LPS, if the product allows (repeatable areas). Thus, we recommend that the production system be designed based on the team's needs and the product requests.