The Five Levels of Commissioning Revisited
The Five Levels of Commissioning Revisited
From Building Startup to Organizational Memory
More than a decade ago, we introduced a concept called the Five Levels of Commissioning. At the time, the objective was straightforward. Owners were frequently told that a building had been commissioned, yet there was little consistency in what that actually meant. One project might include basic functional testing and a final report, while another might deliver extensive documentation, operator training, systems narratives, and long-term operational support. Both projects could legitimately claim to have been commissioned, yet the value delivered to the owner could be dramatically different.
The Five Levels of Commissioning was developed as a practical framework for describing the depth, usefulness, and longevity of the knowledge being delivered. Rather than asking simply whether commissioning had occurred, the framework encouraged owners and project teams to ask what understanding had actually been captured and preserved. Looking back, however, the model may have been pointing toward something much larger. What began as a way to describe commissioning deliverables was, in many respects, an early attempt to describe how organizations learn about their buildings and how that knowledge evolves over time.
Level 1: Basic Commissioning
At its most fundamental level, commissioning verifies that systems have been installed, tested, and are generally operating in accordance with the project requirements. Typical deliverables include commissioning plans, issue logs, functional performance testing, deficiency tracking, and final reports documenting the testing process and its results. This level answers a simple but important question: Was the building commissioned?
For many projects, this remains the primary focus of commissioning efforts. Functional testing provides confidence that equipment operates as intended, deficiencies have been addressed, and major systems have been placed into service. These activities are essential, but they represent only the beginning of what building owners and operators ultimately need to know. A building may pass every functional test performed during construction while still presenting significant operational challenges after occupancy.
Level 2: Systems Knowledge
A building is more than a collection of individual pieces of equipment. It is a collection of interconnected systems working together to achieve a larger operational purpose. At Level 2, the focus expands beyond testing and verification to understanding how those systems are intended to function as an integrated whole. Sequences of operation, system narratives, control diagrams, and functional descriptions begin to provide the context needed to understand not simply what equipment does, but why it does it.
The central question becomes: How is the building supposed to work? For operators and maintenance personnel, this knowledge often proves more valuable over the long term than the testing records themselves. Functional testing demonstrates that systems worked at a particular moment in time. Operational documentation explains how those systems are intended to function throughout the life of the facility and provides the foundation upon which future troubleshooting, optimization, and training efforts depend.
Level 3: Asset Knowledge
As facilities become more sophisticated, organizational knowledge must become more granular. Level 3 focuses on the individual assets that comprise the larger systems. O&M manuals, shop drawings, equipment data, warranty information, maintenance procedures, spare parts information, and asset-specific documentation become organized into a structured body of knowledge that can be readily accessed when needed.
The question at this level becomes: What do we know about this equipment? Most organizations possess some portion of this information, but possession is not the same as accessibility. Valuable documentation is often scattered across file shares, binders, project archives, vendor websites, and personal folders. The challenge is rarely whether information exists; the challenge is finding the right information quickly enough to support decision-making when a problem occurs. Level 3 seeks to organize and preserve asset-specific knowledge so that information becomes usable rather than merely stored.
Level 4: Operational Knowledge
Level 4 represents a significant shift in perspective because it recognizes that the most valuable learning often occurs after construction is complete. Buildings do not stop teaching once they are occupied. In many respects, occupancy is when the most important lessons begin to emerge. Operators discover how systems behave during extreme weather events. Technicians identify interactions that were never fully understood during design. Maintenance personnel develop practical solutions that improve reliability and maintainability. Energy managers learn where performance is being lost and where optimization opportunities exist.
These discoveries represent operational knowledge created through experience rather than design. They reflect how the facility actually behaves rather than how it was expected to behave. Unfortunately, they are also among the most vulnerable forms of knowledge because they often exist only in the minds of experienced personnel. As staff retire, transfer, or move on, years of operational understanding can disappear with them.
Level 4 therefore focuses on preserving operational experience, troubleshooting history, field observations, system adjustments, lessons learned, and the countless insights generated during day-to-day operation. The question becomes: What have we learned from operating the building? In many facilities, the answer to that question contains some of the most valuable knowledge the organization possesses.
Level 5: Institutional Memory
The fifth level emerged from a simple but profound observation. Buildings rarely struggle because information does not exist. More often, they struggle because knowledge becomes fragmented, buried, disconnected, forgotten, or lost as people move on. A sequence of operation is modified, but the reason for the change is never documented. A recurring problem is solved, but the solution remains known only to the individual who solved it. An experienced operator retires, taking decades of practical understanding with them.
The issue is not a lack of data. Modern facilities generate enormous amounts of data. The issue is a lack of memory.
Level 5 focuses on preserving and organizing the collective knowledge of the facility, including design intent, commissioning findings, operational history, corrective actions, engineering decisions, troubleshooting experience, field observations, and lessons learned accumulated over time. The central question becomes: How does the organization remember what it knows?
Viewed this way, commissioning is no longer simply a project activity. It becomes part of a broader effort to preserve organizational knowledge and ensure that understanding survives changes in personnel, technology, and time.
A Different Way to View Existing Buildings
When the Five Levels of Commissioning was first introduced, most commissioning efforts focused on new construction. Today, the industry increasingly finds itself focused on existing buildings, aging infrastructure, deferred maintenance, workforce transitions, and the growing complexity of modern facilities. Owners are being asked to improve efficiency, reduce operating costs, train new personnel, respond to changing regulations, manage sophisticated automation systems, and make better decisions with limited resources.
These challenges cannot be solved through testing alone. They require understanding. In many cases, the greatest opportunities are not found by asking whether equipment works, but by asking whether the organization understands why the equipment behaves the way it does. That distinction may appear subtle, but it fundamentally changes the conversation. A building that has successfully passed functional testing can still struggle operationally. A building that meets its design requirements can still suffer from knowledge loss. A building filled with sensors, trends, and analytics can still lack understanding.
The challenge facing many organizations today is not obtaining more data. It is transforming information into knowledge and preserving that knowledge in a form that remains useful over time.
Beyond Commissioning
In retrospect, the Five Levels of Commissioning may have described something broader than commissioning itself. Each level represents a progressively deeper understanding of the facility and the organization that operates it. The questions remain remarkably relevant today:
Was it commissioned?
How is it supposed to work?
What do we know about the assets?
What have we learned from operating it?
How do we preserve and apply that knowledge over time?
These questions extend well beyond project turnover. They reach into operations, maintenance, training, performance improvement, organizational learning, and long-term facility stewardship. As buildings become increasingly complex and experienced personnel become more difficult to replace, the ability to retain, organize, and apply knowledge may become one of the most important operational capabilities an organization can possess.
The future of building performance may not depend solely on smarter equipment, more sophisticated controls, or better software. It may ultimately depend on whether our organizations can remember what their facilities have already taught them.