6.2 Quality Management Systems

To consistently deliver complex capital projects that meet the Owner's requirements on time and within budget, construction organizations cannot rely on ad-hoc or informal processes. Instead, they must establish and maintain a formal Quality Management System (QMS). A QMS is a structured collection of organizational policies, processes, documented procedures, and detailed records. This system defines how an organization will achieve its quality objectives, manage risk, and continuously improve its performance.

For the Certified Construction Manager (CCM), understanding QMS frameworks is critical. The CM must not only verify that their own professional services (such as design reviews, schedule analysis, and cost estimating) are governed by a QMS, but they must also evaluate, monitor, and audit the contractor's project-specific QMS to ensure it aligns with the project goals.

The ISO 9000 and ISO 9001 Family of Standards

The most widely recognized international standard for Quality Management Systems is the ISO 9000 family, with ISO 9001:2015 specifying the actual requirements that an organization must meet to achieve certification. ISO 9001 does not dictate technical specifications or how to build a building; rather, it defines the management processes an organization must have in place to ensure they consistently deliver services and products that meet customer, regulatory, and statutory requirements.

ISO 9001 is built upon seven core Quality Management Principles (QMPs), which have direct applications in construction management:

1. Customer Focus: The primary focus of quality management is to meet and exceed customer (Owner) expectations. In construction, this involves translating the Owner's Project Requirements (OPR) into precise design and construction parameters.
2. Leadership: Leaders at all levels establish unity of purpose and direction, creating conditions in which people are engaged in achieving the organization's quality objectives.
3. Engagement of People: Competent, empowered, and engaged people throughout the organization are essential to deliver value. On a project site, this means ensuring craftworkers and foremen understand the quality standards and feel empowered to speak up when work is non-conforming.
4. Process Approach: Consistent and predictable results are achieved more effectively and efficiently when activities are understood and managed as interrelated processes that function as a coherent system.
5. Improvement: Successful organizations have an ongoing focus on improvement. In construction, this involves analyzing errors, rework logs, and feedback to refine execution methods on future phases or projects.
6. Evidence-Based Decision Making: Decisions based on the analysis and evaluation of data and information are more likely to produce desired results. This includes using concrete break data, soil compaction logs, and survey tolerances to make engineering decisions rather than relying on "gut feelings."
7. Relationship Management: For sustained success, organizations manage their relationships with interested parties, such as subcontractors and material suppliers.

In the construction industry, a General Contractor or CM firm that is ISO 9001 certified has undergone a rigorous audit by an accredited third-party registrar. This certification proves the firm has documented procedures for document control, contract review, purchasing, design changes, control of non-conforming products, corrective and preventive actions (CAPA), and internal quality audits.

Total Quality Management (TQM) in Construction

Total Quality Management (TQM) is an organization-wide management philosophy focused on continuous integration of quality into all phases of operations. Unlike ISO 9001, which is a rigid standard with audit checklists, TQM is a cultural mindset pioneered by quality gurus like W. Edwards Deming, Joseph Juran, and Philip Crosby.

When applied to construction, TQM shifts the focus from "finding defects at the end" to "building quality in from the start." The core pillars of TQM in construction include:

• Total Employee Involvement: Every individual, from executive leadership and the project manager to the field superintendent and the trade craftworker, shares responsibility for quality. In a TQM culture, workers are encouraged to stop work if they identify a condition that compromises the integrity of the project.
• Continuous Improvement (Kaizen): Processes are constantly analyzed for small, incremental optimizations. For example, a CM might analyze the Request for Information (RFI) turnaround time to streamline communication between the contractor and the architect.
• Supplier and Subcontractor Partnering: TQM rejects the traditional adversarial relationship between general contractors and subcontractors. Instead, it promotes long-term strategic alliances and collaborative relationships, which reduces disputes and increases shared commitment to quality.
• Focus on the Internal Customer: In a construction workflow, each activity has an "internal customer." The concrete crew is the customer of the excavation crew; the drywall crew is the customer of the framing and MEP rough-in crews. TQM dictates that no worker should deliver defective work to their internal customer, preventing cumulative errors.

Six Sigma: A Data-Driven Quality Methodology

Six Sigma is a highly disciplined, data-driven methodology that aims to eliminate defects and minimize variability in processes. Originating in manufacturing, Six Sigma is defined by a defect rate of no more than 3.4 defects per million opportunities (DPMO). While construction is often characterized by unique, custom projects, Six Sigma is increasingly applied to repetitive, modular, or industrialized construction tasks (such as precast concrete fabrication, steel member cutting, or high-rise concrete cycle times).

Six Sigma projects follow a structured improvement framework known as DMAIC:

• Define: Identify the problem, project goals, and customer requirements (Critical to Quality, or CTQ characteristics). For instance, a precast plant might define a problem where structural panels are arriving on site with dimensions outside the specified +/- 1/8 inch tolerance.
• Measure: Gather baseline data on the current process. The team measures the precise dimensions of 1,000 fabricated panels and calculates the standard deviation ($\sigma$) of the process.
• Analyze: Analyze the data to determine the root cause of the variation. Using tools like a Fishbone Diagram (Ishikawa) and a Pareto Chart, the team identifies that thermal expansion of the steel forms and worn-out form latches are the primary causes of dimensional drift.
• Improve: Develop and implement solutions to eliminate the root causes. The plant replaces the latches and adjusts fabrication scheduling to account for temperature swings.
• Control: Put measures in place to ensure the process remains stable and the improvements are sustained. This involves using Statistical Process Control (SPC) charts to track daily dimensions and flag variations before they exceed tolerances.

Lean Construction and Quality

Lean Construction adapts the principles of the Toyota Production System to the design and construction process. Lean focuses on maximizing value for the owner while minimizing waste. In construction, waste is categorized into eight areas (often remembered by the acronym DOWNTIME):

1. Defects: Rework due to incorrect installation or poor workmanship.
2. Overproduction: Doing work before it is required (e.g., pre-fabricating materials before shop drawings are finalized).
3. Waiting: Crews waiting for materials, tools, information, or preceding activities to finish.
4. Non-utilized Talent: Failing to engage field workers in process planning.
5. Transportation: Moving materials or equipment unnecessarily around the job site.
6. Inventory: Storing excess materials that are subject to damage, theft, or deterioration.
7. Motion: Unnecessary physical movement of workers due to poor site layout.
8. Extra-Processing: Doing more work than is specified or required (e.g., gold-plating).

Lean directly reinforces the QMS by improving workflow reliability. The Last Planner System® (LPS)—a core Lean tool—coordinates scheduling by securing reliable commitments from subcontractors. By stabilizing the daily workflow and ensuring crews have the correct materials, tools, and information before they start, LPS dramatically reduces the variability and rushing that lead to quality defects. A key metric in LPS is Percent Plan Complete (PPC), which tracks the percentage of weekly tasks completed as promised. A high PPC correlates directly with reduced rework and higher quality of finish.

Comparison of Quality Management Systems

The following table summarizes the key distinctions between the major quality management methodologies used in construction:

CMAA Guidelines for QMS Integration

According to the Construction Management Association of America (CMAA) Standards of Practice, the CM must facilitate the integration of these quality principles throughout the project's life cycle. During the Pre-Design and Design phases, the CM ensures the design team's quality plan is active, conducts constructability reviews, and assists the owner in establishing the OPR. In the Procurement phase, the CM establishes clear quality evaluation criteria for contractors and ensures quality requirements are detailed in the bid documents. During Construction, the CM audits the contractor's execution of their QMS, verifying that quality control processes are functional and documented, and leads the project closeout quality verification process.