Most evidence-based practice models capstone students encounter, the Iowa Model, PARIHS, Stetler, assume the evidence already exists somewhere and focus on how to find, appraise, and apply it. The ACE Star Model of Knowledge Transformation asks a different, more foundational question first: where does evidence actually come from, and what has to happen to it before it becomes something a bedside nurse can safely use?
That upstream framing is what makes the ACE Star Model distinct. It traces a full cycle, from the moment new knowledge is discovered through primary research, to the moment that knowledge is evaluated in real practice and feeds back into the next round of discovery. For a capstone or DNP project, that cycle gives you a map of exactly where your own work fits inside a much larger system of knowledge production.
This guide walks through the model's origin, its five points, a full worked example, and the specific mistake most students make when applying it, treating the whole star as something they personally have to complete from scratch. For the wider landscape of theories and implementation models this framework sits alongside, see our nursing theory and change frameworks hub. If your program's approved model list also includes a general orientation to nursing theory, our nursing capstone theory guide covers how to choose and justify a theoretical or conceptual framework more broadly.
What Is the ACE Star Model of Knowledge Transformation?
The ACE Star Model was developed by Kathleen Stevens, DSN, RN, FAAN, at the Academic Center for Evidence-Based Practice, known as ACE, at the University of Texas Health Science Center at San Antonio. Stevens introduced the model in the early 2000s as a way to organize a question that had not been well mapped before: how does a piece of new clinical knowledge actually travel from a research study to routine bedside care?
Rather than starting at the point most implementation models start, an existing body of appraised evidence, the ACE Star Model begins at the very beginning of that journey, with the generation of new knowledge through primary research. It then follows that knowledge through four further transformations, each one changing the form the knowledge takes, until it becomes something a working nurse can apply and until its real-world impact has been measured.
The model takes its name from its usual visual form: a five-point star, with each point representing one stage, or one "form," the knowledge passes through. Unlike a straight-line process, the star is explicitly cyclical. Evaluation at the final point does not end the process; it generates new questions and new gaps that feed back into further discovery, closing the loop and starting the cycle again.
Because the model describes a universal pathway rather than a set of doctoral-only tasks, it applies at every program level. What changes between a BSN, MSN, and DNP application is not which points exist, but how much of the cycle a given project realistically works through and at what depth, a distinction covered later in this guide.
The Five Points of the Star
| Point | What it represents | Typical output |
|---|---|---|
| 1. Discovery | New knowledge generated through primary research: randomized controlled trials, cohort studies, qualitative studies, and other original investigations | A single published study reporting new findings |
| 2. Evidence Summary | Synthesizing a body of primary studies into one coherent statement of what the evidence collectively shows | A systematic review, meta-analysis, or integrative review |
| 3. Translation to Guidelines | Converting an evidence summary into a specific, actionable practice recommendation, weighing evidence strength, consistency, and applicability | A clinical practice guideline, protocol, or care standard |
| 4. Practice Integration | Moving the translated recommendation into routine use through organizational and individual behavior change | A adopted protocol, updated workflow, or changed clinical habit |
| 5. Process, Outcomes Evaluation | Measuring the real-world impact of the change on patients, providers, and the system, then feeding new questions back into Discovery | Outcome data that closes, or reopens, the cycle |
Each point represents a distinct transformation of the same underlying knowledge, not a repeat of the same task. Evidence that has been summarized, Point 2, is not yet a practice recommendation, Point 3, and a practice recommendation that exists on paper is not yet Integration, Point 4, until someone is actually following it at the bedside.
Applying the ACE Star Model Step by Step
The steps below walk through the full cycle in order. Read the note after each one for how a typical capstone student engages with that point, since very few projects work through all five at equal depth.
Discovery: Where the Knowledge Originates
New knowledge enters the cycle through primary research, an individual study testing an intervention, describing a phenomenon, or measuring an outcome for the first time. Capstone students almost never generate knowledge at this point themselves; instead, they identify the primary studies that will eventually feed the evidence summary they rely on in Point 2. Name this point briefly in your framework section to show you understand where your evidence ultimately comes from, without implying you conducted original research at this scale.
Evidence Summary: Synthesizing What the Research Shows
This is usually where student work genuinely begins. Locate existing systematic reviews, meta-analyses, or integrative reviews addressing your clinical question, and summarize what they collectively conclude. If a strong existing summary does not exist for your specific question, this is where you build your own smaller-scale synthesis from the primary studies your literature review has gathered.
Translation to Guidelines: Turning Evidence Into a Recommendation
Take the evidence summary and state, specifically, what it means your unit or organization should do. This is where a general finding, such as "structured discharge teaching reduces readmission," becomes a specific, actionable recommendation, such as a defined teach-back script delivered at a defined point before discharge. Where a recognized clinical practice guideline already covers your topic, cite it directly here rather than re-deriving a recommendation from scratch.
Practice Integration: Moving the Recommendation Into Routine Use
Describe how the translated recommendation will actually become part of everyday practice: staff education, workflow or documentation changes, leadership endorsement, and a plan for the specific behaviors that need to change. This is the point where organizational and individual change theory, Lewin's, Kotter's, or a more structured implementation lens like i-PARIHS, most naturally supports the ACE Star Model's broader framing.
Process, Outcomes Evaluation: Measuring the Real Impact
Measure whether the change actually produced the outcome your evidence summary predicted, both the clinical outcome itself and how consistently staff followed the new practice. State plainly what questions your results raise for future work, since in the ACE Star Model, evaluation output is meant to feed directly back into new discovery rather than functioning as a final, closed step.
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Reach for the ACE Star Model specifically when your program or committee wants to see that you understand the full lifecycle of evidence, not just how to apply a single guideline to a single problem. It is a common choice for students whose framework section opens a chapter on evidence-based practice broadly, or whose committee expects a conceptual, big-picture model before narrower implementation details are introduced.
It also fits especially well when your project's evidence base is genuinely uneven across the star, for example when strong systematic reviews exist, Point 2, but no widely adopted clinical guideline yet translates them into a specific recommendation, Point 3. Naming that gap explicitly, and positioning your own project as doing some of that translation work, is a stronger, more sophisticated framing than simply stating you followed an existing guideline.
If your project's real story is almost entirely about organizational context, staff readiness, or a previous change effort that stalled, a model built specifically around implementation, such as i-PARIHS, will likely carry more of that story's weight on its own. Many strong capstones use the ACE Star Model as the outer frame and a more implementation-focused model or change theory to fill in Point 4 in detail, rather than treating the two as competitors.
A Worked Example: Reducing Catheter-Associated Urinary Tract Infections
To make each point concrete, here is how the ACE Star Model plays out on a realistic capstone-style topic: reducing catheter-associated urinary tract infections, CAUTI, on a general medical unit through a nurse-driven catheter-removal protocol.
Discovery. Primary studies over roughly the past two decades have tested nurse-driven urinary catheter removal against physician-order-dependent removal, generally finding shorter catheter dwell time and fewer catheter days when nurses can remove a catheter against defined clinical criteria without waiting for a new order.
Evidence Summary. A systematic review synthesizing this body of research concludes that nurse-driven removal protocols are associated with meaningfully shorter catheter dwell time and a corresponding reduction in CAUTI rates, with the strongest effects seen where the criteria for removal are explicit and built into daily nursing assessment rather than left to individual judgment.
Translation to Guidelines. National infection-prevention guidance, including recommendations referenced by the CDC and professional infection-control organizations, translates this evidence into a specific recommendation: implement daily, criteria-based nursing assessment of catheter necessity, with defined stop criteria a nurse can act on independently.
Practice Integration. The unit adopts a daily catheter-necessity checklist embedded in the existing nursing assessment flowsheet, trains staff on the defined removal criteria during a two-week rollout, and secures a standing order from the medical director authorizing nurse-initiated removal when criteria are met.
Process, Outcomes Evaluation. The project tracks average catheter dwell time and unit-level CAUTI rate for twelve weeks before and after rollout, alongside staff compliance with daily checklist completion. Results feed back into Discovery by identifying which specific removal criteria staff apply inconsistently, a gap a future project, or a future primary study, could investigate further.
Notice that the student's own original contribution sits almost entirely at Points 3 through 5, translating an existing guideline into a unit-specific protocol, integrating it, and evaluating it, while Points 1 and 2 are drawn from, and cited to, existing published work rather than generated from scratch.
The ACE Star Model vs. Other EBP Implementation Models
| Model | How it differs from the ACE Star Model |
|---|---|
| Iowa Model | Begins at a clinical trigger and moves through a linear appraise-and-apply sequence, rather than starting upstream at knowledge generation. See our full Iowa Model guide. |
| PARIHS / i-PARIHS | Gives structured, multi-level attention to context, recipients, and facilitation at the implementation stage, where the ACE Star Model's Integration point is comparatively light. See our full PARIHS and i-PARIHS guide. |
| Stetler Model | Designed for an individual practitioner applying evidence to their own practice, without the ACE Star Model's explicit framing of where evidence originates before it reaches that practitioner. |
| Johns Hopkins EBP Model | Organizes work into a Practice question, Evidence, Translation sequence with detailed evidence-rating tools, but treats knowledge generation and summary as a given starting point rather than distinct stages of their own. |
If a committee member asks why you chose the ACE Star Model over a narrower implementation model, the honest, framework-grounded answer is usually some version of: because the project needed to show where its evidence came from and how it was transformed before it could be applied, not just how it was carried out on a single unit.
Where the ACE Star Model Fits in Your Capstone Document
| Capstone chapter | ACE Star point it corresponds to |
|---|---|
| Introduction / Background | A brief acknowledgment of Discovery: the research base your topic ultimately draws from |
| Literature Review | Evidence Summary: your synthesis of existing systematic reviews and primary studies |
| Theoretical/Conceptual Framework | Full explanation of the ACE Star Model and where your project enters the cycle |
| Methodology (proposal / recommendation) | Translation to Guidelines: your specific, actionable practice recommendation |
| Methodology (implementation plan) | Practice Integration: staff education, workflow change, and leadership support |
| Results / Discussion | Process, Outcomes Evaluation: what your data showed and what it suggests for future work |
See our nursing theory and change frameworks hub for how this model compares with other implementation and change frameworks across a full capstone document, from problem statement through dissemination.
Common Mistakes When Applying the ACE Star Model
- Implying the project worked through all five points at equal depth, including original knowledge discovery, when the actual work sat mainly at Translation through Evaluation
- Treating Evidence Summary and Translation to Guidelines as the same step, when they are distinct transformations: one describes what the evidence shows, the other states what to do about it
- Leaving Practice Integration as a vague sentence about "staff training" instead of naming the specific education, workflow, and leadership steps that moved the recommendation into routine use
- Skipping the feedback loop at Evaluation, and presenting results as a closed endpoint rather than naming what question they raise for future discovery
- Choosing the ACE Star Model for a project whose real story is entirely about organizational readiness, when a more implementation-focused model would carry that story better
- Citing a secondary summary of the model instead of Stevens' original ACE Star Model publications and the Academic Center for Evidence-Based Practice's own materials
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Frequently Asked Questions
The Iowa Model starts from a clinical trigger, a problem your unit noticed, and walks forward through appraising and applying evidence to that specific problem. The ACE Star Model starts further upstream, at the point where new knowledge is first generated through research, and traces the full path that knowledge travels before it reaches a patient's bedside: discovery, summary, translation, integration, and evaluation. Use the Iowa Model when your framework section needs to read as a practical, problem-driven process. Use the ACE Star Model when your program wants you to demonstrate you understand where evidence actually comes from and how it moves through the healthcare system before your project ever begins.
Almost never at Point 1, Discovery. Generating brand-new primary research is a doctoral-dissertation-scale undertaking, not a capstone-scale one. Most BSN, MSN, and DNP capstone students enter the cycle at Point 2, Evidence Summary, by locating and appraising existing systematic reviews and meta-analyses, then move into Point 3, Translation, by turning that summary into a specific practice recommendation for their setting. Naming this entry point explicitly in your framework section, rather than implying you started at Point 1, is one of the clearest signals of a well-understood application of the model.
An evidence summary, Point 2, synthesizes what a body of primary research collectively shows, for example a systematic review concluding that nurse-driven catheter-removal protocols reduce catheter days. A translation or practice recommendation, Point 3, goes a step further and states what a specific team or organization should actually do in response, for example a protocol naming the exact criteria a nurse uses to remove a catheter without a physician order. The summary answers what does the evidence show; the translation answers what should we do about it here.
Yes, with a scoped entry point. A BSN student would rarely work through all five points at doctoral depth, but naming where your project sits on the star, typically Translation through Evaluation, and briefly acknowledging the summary you drew your evidence from, is entirely appropriate at the BSN or MSN level. The model scales down cleanly because its five points describe a universal knowledge pathway, not a set of doctoral-only tasks.
Lightly, by comparison. The ACE Star Model names Integration as one of its five points but does not give it the same structured, multi-level treatment that i-PARIHS gives to context, recipients, and facilitation. If your project's central challenge is organizational readiness or staff buy-in, pairing the ACE Star Model's broader knowledge-transformation framing with a more detailed implementation lens, such as i-PARIHS, or a change theory like Kotter's or Lewin's, at the Integration point is a common and defensible approach.
Three categories, drawn from how the ACE Star Model frames outcomes: patient health outcomes, such as a clinical measure before and after your intervention; provider or process outcomes, such as staff compliance with a new protocol; and, where relevant, economic or efficiency outcomes, such as reduced length of stay or avoided treatment costs. A strong evaluation section names at least the first two rather than reporting only whether the change was implemented.
Yes, and it is a common, well-supported pairing. The ACE Star Model maps the broader path evidence travels from research to practice, while a change theory describes how you move people and a system through that transition at the Integration point specifically. Naming both, the ACE Star Model as your overarching knowledge-transformation framework and a change theory as the mechanism you used at Point 4, is generally stronger than trying to stretch either model to do the other's job.
Yes. Our nursing writers can take your practice problem and setting and write a fully applied ACE Star Model section, naming your entry point on the star, summarizing the evidence you are drawing from, and building out the translation, integration, and evaluation points specific to your project rather than a generic restatement of the five points.