Highlighting 12 Papers from the IGLC 2019 Conference

The $1.6 Trillion Problem: Why Construction Must Embrace Production System Thinking

The International Group for Lean Construction has been convening researchers and industry practitioners every summer since 1993 building one of the most rigorous bodies of knowledge about how construction projects actually work and how they can be made to work better. The Dublin conference brought together approximately 300 attendees from 38 different countries who presented 130 papers across the full spectrum of Lean design and construction research. What follows is a digest of twelve papers that together give a clear picture of where the research is going and why it matters for everyone working in the field.

Behavior-Based Quality: Plan for Quality First, Then Safety, Then Production

The first paper proposes a behavior-based approach to quality management built on a clear sequence: plan first for quality, then for safety, then for production. The goal is no surprises and zero rework. The insight is that certain behaviors upstream specifically, conversations in which expectations are clearly identified and measurable acceptance criteria are agreed, determine the downstream quality outcomes far more reliably than inspection systems that catch defects after they are already built in. This reframes quality from a post-process audit function to a pre-process design discipline. When the team understands exactly what they are building and has defined what done looks like before work begins, the rework that consumes three to six percent of total project costs becomes preventable rather than inevitable.

Barriers to Lean Implementation: What Actually Stops Organizations

The second paper identified and ranked twenty-seven barriers to Lean implementation through surveys of Lean construction professionals. The top three, lack of top management support, misperception about Lean practices, and lack of information sharing, reveal a consistent pattern. Lean fails not because the tools are wrong but because the organizational conditions required to use them correctly are not in place. Top management that endorses Lean in words but does not model it in behavior, leaders who treat Lean as a toolbox rather than a philosophy, and organizational cultures that hoard knowledge rather than sharing it, these are the conditions that prevent implementation from taking hold. Removing these barriers before introducing tools produces dramatically better outcomes.

Building Lean Culture Beyond the Core Team

The third paper describes a Lean Leadership training program that, over three years, reached more than 400 participants and then extended beyond the core company to include prefabrication partners, equipment rental providers, and virtual design and construction support teams across the value stream. The most important finding is that Lean culture cannot be contained within a single organization on a construction project. The value stream includes every entity that contributes to production and if the general contractor’s field teams are practicing pull planning and daily huddles while the prefabricator is still running batch production and the VDC team is still issuing coordination drawings in large packages on milestone dates, the production system will not achieve the flow it is designed for. Lean leadership training that extends to strategic partners is not generosity; it is production strategy.

Capability-Building as a Competitive Advantage

The fourth paper examines whether Takahiro Fujimoto’s theory of capability-building competition from the automobile industry applies to construction. Looking at a series of project teams that prefabricated and installed exterior wall panels on six different buildings, the paper finds that the theory is directly relevant. Organizations that build production capabilities, the ability to design reliable processes, learn from their execution, and improve each iteration, develop a competitive advantage that is fundamentally different from the cost-based competition that most of the construction industry engages in. Lean management and process capability are required to make value flow to customers. This is not a research abstraction. It is why the contractor who has implemented Lean genuinely who has built the pull planning capability, the zone leveling capability, the make-ready discipline can deliver faster, better, and often cheaper than a competitor relying on traditional approaches.

When Business Cases Are Not Enough

The fifth paper examines what actually motivates people to engage with Lean and finds that a compelling business case is necessary but not sufficient. Survey data from a major infrastructure project reveals that focusing on time and cost savings as the primary motivation for Lean adoption can actually reduce motivation for some groups. People who are intrinsically motivated by quality, by craftsmanship, by the satisfaction of work done well, are not primarily moved by efficiency arguments. And people who are asked to change practices they have used for twenty years need something more than a cost-benefit analysis to do so. The implication is that Lean adoption strategies must address motivation at the level of values and identity, not just at the level of performance metrics.

Buffer Management in Takt Planning

The sixth paper provides an overview of how buffers function within Takt planning systems and how they can be used effectively. The central finding is that Takt planning’s advantage over conventional scheduling comes substantially from how it manages buffers making them explicit, placing them strategically, and using them to absorb variation rather than allowing variation to absorb the schedule. This confirms what field implementation consistently shows: Takt-planned projects that calculate and protect their buffers finish ahead of schedule. Projects that plan without buffers, or treat buffers as waste rather than as production tools, face the same overrun patterns as CPM-planned projects.

The Integrated Last Planner and Takt System

The seventh paper argues that the Last Planner System aligns directly with the Toyota Production System’s management philosophy and is the primary vehicle for integrating the minds-and-hands of project participants from early design through handover. Takt is described as a work structuring tool that can be integrated into the Last Planner System when the project has repeatable areas. The recommendation is that the production system should be designed based on what the team needs and what the product requires, not imposed as a universal template. This is the practical wisdom that experienced Takt practitioners have developed: Takt planning is not a one-size-fits-all tool. It is a production design discipline that takes the specific characteristics of the building and the team as its starting inputs.

When Takt Plans Meet Real Conditions

The eighth paper takes a critical look at a Takt planning implementation where the Takt rhythm was practically lost toward the end of the project, yet the project still achieved excellent results in cost, time, quality, and customer satisfaction. The finding is provocative: the excellent outcome was not produced by the Takt plan itself, but by the real-time situational awareness provided by a digitalized smart site and disciplined field leadership. This is an honest finding that every Takt practitioner should sit with. The production system is not sufficient on its own, the quality of leadership and the capacity for real-time adaptation determine whether a production plan survives contact with the actual project.

How Three Leading Companies Practice Takt

The ninth paper compares Takt planning as practiced by Porsche Consulting, the Boldt Company, and Veidekke in Norway finding significant commonality in practical application alongside meaningful differences in how subcontractors are involved, which project types are targeted, and how zones are defined. The most important finding is the one that every organization implementing Takt should hear: Takt is currently dependent on key individuals who are familiar with the method. It has not yet been codified into an accessible guideline that organizations can follow without those key individuals. This is the argument for documented, shareable Takt knowledge exactly what the books, videos, and training programs at LeanTakt exist to provide.

Metrics in VDC Projects

The tenth paper examines how building design processes should be measured to support continuous improvement in Virtual Design and Construction contexts. The finding is that few studies exist on VDC metrics despite their importance, and that selecting adequate metrics is genuinely challenging, metrics can demand more effort than the value they return. The paper proposes six basic metrics for building design processes. The broader lesson for construction management generally is one that applies beyond VDC: what gets measured shapes what gets managed, and the wrong metrics produce the wrong behaviors.

The Theoretical Foundation of Quality Management

The eleventh paper traces the philosophical origins of quality management finding that Shewhart’s original formulation was grounded in production theory and the scientific method (later named PDCA), and that subsequent developments, including ISO standards, repeatedly rediscovered and then lost this foundation. The practical implication is that quality management and Lean production theory share deeper roots than most practitioners realize, and that integrating them rather than treating them as separate systems reflects both their historical relationship and their practical complementarity.

Mistake-Proofing and TRIZ

The twelfth paper presents six principles of mistake-proofing, known as poka-yoke, alongside the forty principles of the Theory of Inventive Problem Solving. Both are underused in the AEC industry relative to their potential. The core insight is that most construction defects are not failures of worker skill, they are failures of system design that allow errors to occur. Designing systems that make incorrect installation physically difficult or impossible eliminates an entire category of quality problems before they arise. If your project needs superintendent coaching, project support, or leadership development, Elevate Construction can help your field teams stabilize, schedule, and flow.

Lean construction research is expanding across every dimension from production theory to cultural transformation to digital integration to quality system design. The practice is advancing faster than the industry adopts it, which means the practitioners who stay engaged with the research have a genuine competitive advantage.

On we go.

Frequently Asked Questions

What is the IGLC and why does its research matter for practitioners?

The International Group for Lean Construction is an annual conference that brings together researchers and industry practitioners to advance Lean design and construction. Its research directly informs the tools, frameworks, and practices that field teams use making it the most relevant academic body for construction practitioners interested in Lean.

What are the top three barriers to Lean implementation according to the research?

Lack of top management support, misperception about Lean practices, and lack of information sharing and integrated change control. All three are organizational and cultural conditions rather than technical problems.

Why is Lean culture training important for the extended value stream, not just the core project team?

Because the production system includes every organization that contributes to it. If prefabricators, suppliers, and coordination partners are not practicing compatible methods, the overall system cannot achieve the flow that Lean planning is designed to create.

Why can a Takt plan succeed in delivering good project outcomes even when the Takt rhythm is lost?

Because the plan creates situational awareness, visual management discipline, and a production mindset that supports effective field leadership even when the original rhythm is disrupted. Good results come from the culture the plan creates, not only from the plan’s precise execution.

What is mistake-proofing and how does it apply to construction quality?

Mistake-proofing is the design practice of making incorrect installation physically difficult or impossible, so that errors are prevented by the system rather than caught by inspection. It is underused in construction relative to its potential for eliminating defects at the source.