What an Effect Size Actually Tells a Leader (And What It Doesn't)

Somewhere in the last two decades, "effect size" became a piece of leadership vocabulary — a number leaders cite the way they used to cite intuition. It shows up in professional development slides, in initiative rollouts, in the justification for why this year's focus is this and not that. Used well, it's one of the more honest tools available for prioritizing scarce time. Used poorly, it becomes a way of dressing up a decision that was already made in the language of certainty it doesn't deserve.

It's worth understanding what the number is actually doing before leaning on it in front of a team.

The basic idea, stripped of jargon

An effect size is a way of measuring how much difference a practice makes, expressed in a standardized unit so that different studies — measuring different things, with different tests — can be compared on the same scale. Rather than saying "test scores went up," which tells you nothing about whether that increase was large or trivial, an effect size tells you the size of the shift relative to the normal spread of outcomes you'd see anyway.

A rough, widely cited benchmark treats an effect size of roughly 0.4 as equivalent to about a year's worth of typical growth in a year's time — in other words, the average effect of simply getting a year older and having some instruction, regardless of what that instruction specifically was. Practices below that line may still be worth doing, but they're not outperforming the baseline of normal development. Practices meaningfully above that line are candidates for real prioritization, because they're moving outcomes faster than time alone would.

Why this number is genuinely useful

Every leader operates inside a scarcity problem: finite meeting time, finite coaching cycles, finite attention from an already-stretched team. Effect size research offers something rare — a rough, evidence-based way to rank competing initiatives instead of choosing based on which one is newest, loudest, or most recently pitched by a compelling speaker. If you have to pick one or two things to go deep on this year, "which of these has the strongest evidence of actually moving outcomes" is a far better filter than "which of these do I have the most conviction about."

It's also a useful tool for saying no. Leaders who can point to a number when declining the fifteenth well-intentioned initiative of the year have an easier time protecting focus than leaders relying purely on judgment calls that can be second-guessed.

Where it gets misused

The number invites a kind of false precision. A few cautions worth holding onto:

Context doesn't transfer perfectly. An effect size calculated across a broad research base doesn't guarantee the same result in your specific setting, with your specific population, implemented at your specific level of fidelity. The number describes an average across many contexts, not a guarantee for any one of them.

Implementation quality swamps the number. A high-effect-size practice implemented poorly will underperform a moderate-effect-size practice implemented with real fidelity and coherence. The research measures the practice under conditions of reasonably faithful implementation — which is exactly the variable most likely to break down in a real building under real time pressure.

It measures average effect, not effect for your specific gap. A practice with strong average effects may do very little for the particular subgroup or particular skill deficit you're most worried about. The number is a starting filter, not a diagnosis.

Comparing effect sizes across very different studies is riskier than it looks. Different measurement instruments, different populations, and different research designs all shift what a given number actually represents. Treating a league table of effect sizes as a precise ranking rather than a rough guide overstates what the underlying research can support.

How to use it without overselling it

The strongest use of effect-size data isn't as proof, it's as a starting filter: use it to narrow a long list of possible priorities down to a short one worth investigating more closely, then pair the number with your own local data before committing significant time to it. When you introduce a practice to a team on the strength of its effect size, be honest about the caveat — this is evidence that it tends to work, not a guarantee it will work here, which is exactly why implementation fidelity and local monitoring matter as much as the initial decision.

Leaders who treat effect size as one input among several — alongside context, capacity, and coherence with what's already underway — get real value from it. Leaders who treat it as an oracle tend to be surprised, a year later, when the number didn't deliver on its own.

A worked example

Imagine two competing practices under consideration, one with an effect size around 0.6 and one around 0.3, both requiring roughly the same investment of training and time. The number alone suggests a clear choice. But suppose the 0.3 practice is already partially embedded in existing routines, well understood by staff, and aligned with three other current priorities, while the 0.6 practice would require building an entirely new structure from scratch, with no existing staff expertise to draw on. The raw number still favors the second option, but a leader weighing implementation reality alongside the evidence might reasonably choose the first, betting that high-fidelity execution of a moderately effective practice will outperform low-fidelity execution of a theoretically stronger one. This isn't ignoring the evidence — it's using it as one input inside a fuller judgment, which is precisely what the research base itself would recommend if you read the caveats as carefully as the headline number.

How You Make People Feel Outlasts What You Told Them

Every leader eventually confronts a strange asymmetry: the memos you agonized over are forgotten within a month, and a two-minute hallway conversation you barely remember having becomes, for the person on the other end, a story they tell for years. What gets remembered isn't the content of most interactions. It's the feeling attached to them.

This is uncomfortable for leaders who lean on information as their primary tool — the detailed plan, the well-reasoned rationale, the comprehensive email. All of that matters, but it's not what people carry with them. What they carry is simpler and harder to manufacture: did this person make me feel capable, or small? Seen, or invisible? Safe to fail in front of, or exposed?

Why this isn't just a "soft skills" observation

It's tempting to file this under sentiment and move on to strategy. But the practical stakes are significant. People who feel evaluated rather than supported hide problems instead of surfacing them. People who feel dismissed rather than heard stop offering ideas, which means the leader loses access to the earliest, cheapest signal that something is going wrong. People who feel respected under pressure are the ones who stay through the hard years, and the ones who tell the truth when it isn't convenient.

None of this is about being nice for its own sake. It's about the fact that the emotional residue of an interaction determines what happens after it — whether someone comes back with the next problem, or quietly routes around you.

The gap between intention and impact

Most leaders don't intend to make people feel small. The gap almost always shows up in moments of time pressure, when efficiency wins out over presence — the rushed hallway correction, the email that reads more clinically than it was meant to, the meeting where someone's idea gets steamrolled because there wasn't time to sit with it. None of these are cruelty. They're the ordinary cost of running fast. But the person on the receiving end doesn't experience your intent; they experience the interaction.

This is why it's worth periodically asking a blunt question: if I only had the last thirty days of interactions with this person to go on, what would they conclude about how I see them? Not what you meant. What actually landed.

Practices that hold up under pressure

A few habits separate leaders who consistently leave people feeling built up from those who don't, even under identical time constraints:

They name what they see before they name what needs to change. Leading with the problem trains people to brace every time you approach. Leading with a specific, honest observation about what's working changes the emotional entry point of the whole conversation — and it doesn't require lowering the bar on the correction that follows.

They ask before they assume. "Walk me through what happened" lands very differently than "here's what went wrong." The first invites a person into the conversation; the second puts them on trial before it starts.

They protect people in public and correct them in private, even when the public failure is tempting to address immediately. The five-minute delay costs almost nothing. The public correction costs trust that takes months to rebuild.

They remember the specifics. Not just "how's it going," but the actual thing that person mentioned three weeks ago — the sick parent, the project they were nervous about, the idea they floated that got tabled. Being remembered, specifically, is one of the cheapest and most underused signals of genuine regard.

The long game

None of this shows up on a dashboard. It's not the kind of leadership work that gets recognized in the moment. But talk to people who've left an organization and ask what they remember about the leaders who mattered to them, and the pattern is almost universal: it's rarely the strategy. It's whether that person made them feel like they mattered while the strategy was being built. That's not a soft add-on to leadership. For most people, it isthe leadership they experienced.

A test for your own patterns

It's worth occasionally running a genuine audit of your last few weeks of interactions with a specific person, not from memory but by actually reconstructing them. How many were rushed? How many led with correction rather than acknowledgment? How many happened in front of others rather than privately? Most leaders are surprised by the answer, not because they're careless, but because the pace of ordinary work naturally erodes the presence that warmth requires, one rushed interaction at a time, without any single moment feeling like a failure. The fix usually isn't a grand gesture. It's noticing the pattern early enough to adjust it before the person on the other end has quietly concluded something about how you see them — a conclusion that, once formed, takes far longer to undo than it took to create.

One more habit worth naming

A simple, low-cost practice that reinforces all of this: end difficult conversations by checking in on the relationship itself, separately from the content just discussed — a quick, genuine 'are we okay' that isn't rhetorical. It takes ten seconds and it does real work, because it separates the content of a hard conversation from the health of the relationship carrying it, which is exactly the distinction that determines whether someone walks away feeling corrected or feeling diminished.

No Teachers, No Schools: How K-12 HR Leaders Can Navigate the National Teacher Shortage

Meta description: Dr. Brian Redmond of Clark County School District shares how K-12 HR leaders can tackle the national teacher shortage with smart recruitment, pipeline development, and creative solutions.

The teacher shortage is not coming. It is already here.

Across the United States, school districts are opening the school year with hundreds of unfilled positions. Classrooms are being covered by substitutes, administrators, and sometimes no one at all. The pipeline of new teachers entering the profession is shrinking while the number of educators leaving continues to climb. For those of us working in K-12 Human Resources, this is not a headline. It is our daily reality.

I have seen it firsthand at the Clark County School District in Las Vegas, Nevada. As Director of Human Resources and Leadership Development at one of the largest school districts in the country, my team faces the challenge of staffing over 42,000 positions in a competitive market while serving more than 320,000 students. What we have learned along the way is that there is no single fix. But there are strategies that work.

Understand Why Teachers Are Leaving

Before you can solve a retention problem, you have to understand it. Teachers are leaving the profession for a variety of reasons: compensation, burnout, lack of administrative support, and feeling undervalued. Exit interview data, staff surveys, and honest conversations with teachers will tell you more than any national report. HR leaders in K-12 must be close enough to the ground to hear what is actually happening in schools, not just what looks good on a dashboard.

At CCSD, we made it a priority to analyze our turnover data by school, by subject area, and by years of experience. That information shaped where we focused our recruitment and retention energy. Data without action is just noise. Use it to make decisions.

Build Your Own Pipeline

One of the most effective things a school district can do is stop waiting for certified teachers to appear and start growing their own. Grow-your-own programs, paraprofessional pathways, and partnerships with local universities can create a steady stream of candidates who are already invested in your community.

At Clark County School District, we implemented a $6 million ESSER-funded tuition program that supported over 600 future teachers in earning their credentials. These are individuals who already work in our schools, know our students, and want to stay. That kind of investment pays dividends for years.

If your district does not have a grow-your-own program, now is the time to build one. The teacher shortage is not a short-term disruption. It is a structural problem that requires a long-term solution.

Think Beyond Borders

When domestic pipelines are not enough, creative districts look elsewhere. The J-1 Visa International Teacher Program allows school districts to recruit qualified educators from other countries to fill critical vacancies, particularly in high-need subject areas like math, science, and special education.

At CCSD, we launched and expanded our international teacher program as one part of a broader recruitment strategy. International teachers bring diverse perspectives into classrooms and often develop deep roots in the communities they serve. It is not a replacement for building a local pipeline, but it is a valuable tool in the broader HR strategy.

Compete on More Than Salary

Many districts cannot win a salary war with the private sector or neighboring districts with deeper pockets. But compensation is only one piece of why people choose a job and stay in it. Culture, leadership quality, professional development, flexibility, and a sense of purpose all factor into a teacher's decision to stay or go.

HR leaders should work closely with school and district leadership to make sure the employee experience matches the promises made during recruitment. A great hiring process that leads to a poor onboarding experience will cost you teachers within the first two years. Retention starts on day one.

Elevate HR as a Strategic Partner

Perhaps the most important shift K-12 districts can make is treating Human Resources as a strategic function rather than a transactional one. When HR has a seat at the leadership table, when workforce planning is built into the budget process, and when data drives staffing decisions, districts are far better positioned to respond to challenges like the teacher shortage.

The districts that are navigating this moment most successfully are not the ones with the most resources. They are the ones with the most intentional HR strategy.

The teacher shortage is a serious problem. But it is not unsolvable. With the right systems, the right partnerships, and a genuine commitment to the people doing the work, school districts can build a workforce that is resilient, diverse, and ready for whatever comes next.

That is the work. And it is worth doing.

Brian J. Redmond, Ed.D. Director of Human Resources, Clark County School District

Unleashing Authentic Leadership: The Power of Storytelling

In the ever-evolving landscape of management development, leaders face the challenge of navigating a complex web of responsibilities. From managing diverse teams to fostering a culture of continuous learning, leaders must wear many hats. However, amidst the myriad of tasks, there lies a transformative tool that has the potential to elevate leadership to new heights: authenticity and storytelling.

Authentic Leadership: The Foundation of Trust

Authenticity is the cornerstone of effective leadership. Whether in the business world or government-based industries, trust is paramount, and authentic leaders need to build strong, collaborative relationships with their teams, students, clients, and the wider community. Authenticity breeds trust because it emanates from a genuine alignment between one's values, actions, and communication.

Leaders who embrace authenticity cultivate an environment where people feel seen, heard, and valued. This, in turn, fosters a sense of belonging and purpose, empowering individuals to contribute their best to the collective mission of education.

Storytelling: The Bridge to Connection

While authenticity provides the foundation, storytelling becomes the bridge that connects leaders with their audience. Humans are wired to respond to stories, as they evoke emotions, create empathy, and make information memorable. Leaders can harness the power of storytelling to communicate their vision, values, and goals in a compelling and relatable manner.

Stories have the unique ability to transcend facts and figures, making complex concepts more accessible. Whether sharing personal anecdotes, highlighting the achievements of the school community, or narrating the challenges and triumphs of the educational journey, storytelling humanizes leadership and resonates with the hearts and minds of those involved.

Practical Strategies for Authentic Leadership Through Storytelling

Share Personal Narratives: Leaders can connect with their audience by sharing personal stories that highlight their values, motivations, and challenges. This vulnerability fosters a sense of intimacy and trust.
Celebrate Success Stories: Amplifying the achievements of students, teachers, and staff members through storytelling not only acknowledges their contributions but also inspires others to strive for excellence.
Acknowledge Challenges and Growth: Transparency about the challenges faced by the community in which the leader is connected, along with the lessons learned and strategies for improvement, humanizes leadership. It demonstrates resilience and a commitment to continuous improvement.
Create a Shared Narrative: Involve stakeholders in the co-creation of a shared narrative that encapsulates the identity and aspirations of the educational institution. This collective story reinforces a sense of belonging and shared purpose.

Conclusion

In the dynamic world of private and public leadership, where change is constant, authentic leadership and storytelling stand out as powerful tools for building trust, fostering connection, and inspiring positive change. As leaders embrace their authentic selves and weave compelling narratives, they not only shape the present but also pave the way for a future where learning flourishes and communities thrive.