By Ann Marvin, IMA Worldwide
AIM and ADKAR are often discussed as change management methodologies, but they are not built around the same unit of analysis or the same implementation problem. This change management methodology comparison matters when an organization is deciding which enterprise change management framework fits a complex transformation.
AIM, the Accelerating Implementation Methodology from IMA Worldwide, examines the organizational and environmental conditions that determine whether a change is implemented, not merely installed. ADKAR, developed by Prosci, stands for Awareness, Desire, Knowledge, Ability, and Reinforcement, and describes the sequence an individual moves through during a change.
This comparison looks at how each methodology addresses implementation, individual change, sponsorship, readiness, resistance, reinforcement, measurement, and organizational scale, so enterprise decision-makers can judge which lens fits the change they are leading.
AIM and ADKAR Start From Different Questions
The clearest distinction between AIM and ADKAR is the question each one asks first.
ADKAR asks, at the individual level, whether a person has Awareness of why the change is happening, Desire to participate in it, Knowledge of how to change, Ability to demonstrate new skills and behaviors, and Reinforcement to sustain the change once it is made. It is a sequential model: each element depends on the one before it.
AIM asks a broader question: what conditions in the implementation environment are affecting whether target groups can and will adopt new behaviors and deliver the intended business results? That includes sponsorship, resistance, reinforcement, and organizational readiness, examined across the groups whose behavior has to change, not only the individuals within them.
Neither model ignores the other’s focus entirely. ADKAR’s Reinforcement element accounts for the environment around the individual, and AIM’s target groups are made up of individuals. The difference is one of emphasis and unit of analysis: ADKAR is built around individual progression, while AIM is built around the implementation system surrounding that progression.
What Is the AIM Methodology?
AIM, the Accelerating Implementation Methodology, is IMA Worldwide’s approach to managing organizational change, grounded in more than 40 years of field research into the human and organizational factors that affect implementation success.
A central concept in AIM is the distinction between installation and implementation. Installation is the technical or structural act of putting a solution in place: a new system, process, or organizational design. Implementation is what happens after that: whether people demonstrate the new behaviors required to produce the intended business result. AIM treats the gap between installation and implementation as the primary risk in most change efforts, and organizes its diagnostic work around closing it, looking at sponsorship, target group readiness, resistance, and reinforcement as the conditions that determine whether new behaviors take hold.
What Is the ADKAR Model?
ADKAR is Prosci’s model for understanding how an individual moves through change. The name is an acronym for its five building blocks: Awareness of the need for change, Desire to support it, Knowledge of how to change, Ability to implement new skills and behaviors, and Reinforcement to make the change stick.
Each element builds on the one before it: an individual who has Knowledge but no Desire, for instance, is unlikely to progress, which gives change practitioners a way to diagnose where a specific person’s transition is stalling. Prosci pairs the model with assessment tools, training, and a certification program built around applying ADKAR to individual and team-level change.
Prosci vs AIM: Key Differences at a Glance
The table below sets AIM side by side with the Prosci ADKAR model across the dimensions enterprise decision-makers weigh most.
How AIM and ADKAR Define the Unit of Change
One of the clearest distinctions between the two methodologies is where the diagnostic lens is placed.
ADKAR gives practitioners a way to examine an individual’s progress through change and to identify which element, Awareness, Desire, Knowledge, Ability, or Reinforcement, is missing for that person. AIM places greater emphasis on the conditions surrounding target groups: the sponsorship, incentives, and reinforcement that shape whether new behaviors are adopted across a population, not just understood by any one person in it.
That emphasis matters because an individual can have Awareness, Desire, Knowledge, and Ability and still fail to change, if the surrounding system does not support it. A person may understand a change and be able to perform it, yet still work in an environment where managers reinforce the old process, competing priorities remain unresolved, sponsorship is weak, existing measures haven’t been updated, or the consequences in place favor the old behavior over the new one. AIM’s target-group and organizational focus is built to surface and address those conditions. This does not mean ADKAR ignores the organization, or that AIM ignores the individual; it means the two methodologies start their diagnostic work from different points.
How AIM and Prosci Approach Sponsorship
AIM gives sponsorship a defined, operational role in implementation. It distinguishes between Authorizing Sponsors, who have the organizational authority to approve and fund a change, and Reinforcing Sponsors, who are closer to the target groups and responsible for reinforcing the change day to day. AIM also looks at whether sponsorship cascades effectively from senior leaders down through the layers of the organization affected by the change, and it evaluates sponsorship in terms of observable behavior: whether sponsors express support for the change, model the new behaviors themselves, and reinforce those behaviors in others.
Prosci’s approach also recognizes sponsorship as important to successful change, positioning active and visible executive sponsorship as one of the contributing factors to successful outcomes within its broader model. The methodologies differ in how far each one operationalizes sponsorship: AIM builds it into the diagnostic and implementation structure directly, with defined roles and expected behaviors, while Prosci treats it as a supporting factor alongside the ADKAR sequence. A closer look at the leadership and sponsorship gap that often affects change outcomes is available on IMA Worldwide’s sponsorship and leadership involvement page.
How AIM and ADKAR Approach Resistance
AIM treats resistance as information, not as a behavioral problem to be overcome. When a target group resists a change, AIM’s diagnostic work asks what that resistance reveals about the implementation conditions: whether sponsorship is unclear, whether the change conflicts with existing incentives, or whether the group has legitimate operational concerns that have not been addressed. Resistance, in this view, points to something in the system that needs attention. IMA Worldwide’s dedicated look at resistance to change covers this diagnostic approach in more depth.
ADKAR approaches resistance indirectly, through the lens of individual progression. If a person is resisting a change, ADKAR practitioners look at which element, Awareness, Desire, Knowledge, or Ability, is unmet for that individual, and address the barrier at that stage. Both approaches treat resistance as diagnostic rather than as something to eliminate through persuasion alone; they differ in whether the diagnosis is aimed at the individual or at the surrounding implementation system.
AIM vs ADKAR on Reinforcement
Both methodologies use the term reinforcement, but not in the same way, and the distinction is worth making precisely.
In ADKAR, Reinforcement is the fifth and final element of the sequence: the mechanisms, recognition, and accountability that keep an individual from reverting to old behavior once a change has been made. It applies after Awareness, Desire, Knowledge, and Ability have already been established.
In AIM, reinforcement is an ongoing organizational condition, not a final stage. It refers to whether the systems around a target group, management behavior, measures, rewards, and consequences, consistently support the new behavior rather than the old one. AIM treats weak or inconsistent reinforcement as one of the more common reasons a technically installed change fails to become a lasting implementation, and it is assessed continuously, not only at the end of a change effort.
How AIM and ADKAR Assess Readiness
Readiness means something different in each methodology. In AIM, readiness is assessed at the level of the target group and the organization: whether the conditions, sponsorship, resistance, reinforcement, and change agent capacity, are in place for a given group to adopt new behaviors. This is an implementation condition, not a single score, and it is used to guide where implementation effort needs to be concentrated.
Prosci’s approach to readiness works from the individual level, using assessment tools built around the ADKAR sequence to identify where a person or team stands relative to Awareness, Desire, Knowledge, Ability, and Reinforcement. IMA Worldwide’s own readiness and assessment work is covered in more depth for organizations evaluating implementation risk.
How AIM and ADKAR Measure Change
AIM’s measurement focus is on observable behavior and implementation conditions: whether target groups are demonstrating the new behaviors required, whether sponsorship and reinforcement are functioning as needed, and whether resistance and readiness indicators are moving in the right direction. The underlying question AIM’s measurement is built to answer is whether the intended business result is being achieved, not only whether a solution has been installed.
ADKAR’s measurement is oriented around individual and team progress against its five elements: identifying where a person or group stands on Awareness, Desire, Knowledge, Ability, and Reinforcement, and using that position to target further support. Neither methodology’s measurement approach should be read as a complete scorecard for a change effort on its own; each is built to answer the specific diagnostic question its methodology asks.
Why Installation vs Implementation Matters in the AIM Approach
The distinction between installation and implementation is one of AIM’s clearest differentiators from ADKAR, and it does not have a direct equivalent in the ADKAR sequence.
Installation means a solution has been technically or structurally put in place: a new system is live, a new process is documented, a new org structure is drawn. Implementation means people are demonstrating the new behaviors required to produce the intended business result. AIM’s underlying premise is that installation is necessary but not sufficient. Many change efforts install a solution successfully and still fail to achieve their business result, because the people affected never fully changed how they work. AIM’s practice areas are organized around closing that gap, which is why sponsorship, resistance, reinforcement, and readiness are treated as implementation factors rather than as separate concerns.
AIM vs Prosci Certification: What Are You Learning?
The two certification paths reflect the same distinction in orientation as the methodologies themselves.
An AIM practitioner is trained to diagnose implementation conditions across an organization: to assess sponsorship, target group readiness, resistance, and reinforcement, and to build an implementation plan that addresses the gap between installing a solution and achieving the intended business result. IMA Worldwide’s “AIM Practitioner Certification” prepares practitioners to apply that diagnostic approach to enterprise-scale change.
Prosci’s certification prepares practitioners to apply the ADKAR model to individual and team-level change, using its assessment tools to identify where a person’s transition is stalling and to select the right intervention for that stage.
Can AIM and ADKAR Be Used Together?
AIM and ADKAR are not necessarily mutually exclusive. Some organizations use ADKAR as an individual-level diagnostic, to understand where a specific person or team stands in a change, while using AIM to address the broader sponsorship, resistance, reinforcement, and readiness conditions across the target groups affected. Whether that combination makes sense depends on the organization’s existing change capability, the scale of the transformation, and how the two methodologies are integrated in practice. This is not a claim that most enterprises combine them as standard practice, only that the two are addressing different layers of the same change and can, in the right circumstances, complement each other.
Who Should Consider AIM?
AIM tends to be particularly relevant for organizations facing complex enterprise transformations that involve multiple target groups, significant dependence on sponsors at different levels of the organization, and a need for sustained behavior change rather than a single go-live event. It is also worth considering for initiatives where organizational reinforcement is critical to the outcome, where a technical go-live does not guarantee the intended business result, and where leadership wants a deeper diagnostic view of implementation risk than an individual-level model provides on its own.
Who May Find ADKAR Useful?
Organizations or practitioners looking for a straightforward, recognizable framework for diagnosing an individual’s progression through change may find ADKAR useful, particularly for changes that are more contained in scope or where the primary challenge is understanding and supporting specific people through a transition. Its five-element structure gives change practitioners a common language for talking about where an individual stands, which is valuable regardless of which organizational-level methodology, if any, is layered on top of it.
AIM vs ADKAR: Which Approach Fits the Change You Are Leading?
The right answer depends on the question an organization needs answered.
If the primary need is understanding how an individual is moving through a change, ADKAR offers a recognizable, individual-level diagnostic model built around five clear elements.
If the need is diagnosing and managing the wider organizational conditions that determine whether new behaviors are sustained and the intended business result is achieved, AIM provides a broader implementation lens, built around the distinction between installing a solution and implementing it.
Many enterprise transformations involve both questions. Understanding where each methodology’s strength lies is the first step toward choosing the right lens, or combination of lenses, for the change ahead.
