Are You On Schedule?

It’s halftime. You’re down 14–3. The scoreboard says one thing, but the game may be telling you something else. Your offense is consistently creating manageable second downs. Two giveaways and an explosive play allowed account for much of the deficit. Do you change the plan, or stay with what’s working?

The answer depends on what you’re measuring.

Three statistics help separate how consistently a team executes, how much value its plays create, and how much the game’s biggest swings shape the result: Efficiency, Expected Points Added (EPA), and Toxic Differential. Each matters. But they aren’t interchangeable, and they shouldn’t carry the same weight at every point in a game.

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The three metrics and what they actually tell you

1. Efficiency (Success Rate): Are we staying on schedule?

Play Call Efficiency, also referred to as Success Rate, answers a straightforward question: How consistently does a play gain enough yardage to put you in manageable down-&-distance situations?

By definition a play is considered successful when it gains:

• 1st down: at least 4 yards or more on first down;

• 2nd down: at least 50% of the yards needed to convert to a first down; or

• 3rd or 4th down: the full distance needed to convert.

Every play receives a simple success-or-failure label. A five-yard gain on first-and-10 is a success. A four-yard gain on third-and-five is a failure. A 50-yard touchdown counts as one successful play, just like a routine first-down gain that meets the threshold.

That’s the point. Success Rate measures down-to-down consistency, not the size of the reward. It helps coaches identify whether a run concept, protection answer, formation, or personnel package is reliably putting the offense in favorable situations.

2. EPA: How much scoring value did the play create?

Expected Points Added (EPA) measures how a play changes the points a team can reasonably expect from the game situation. An expected-points model considers factors such as down, distance, field position, and time remaining. After the play, that expectation changes.

On a non-scoring play: EPA = Expected Points after − Expected Points before. For a scoring play, the calculation also credits the points scored; a change of possession reverses the opponent’s expected points into a cost for the original offense.

Here's an example:

• First-and-10 at your own 25: expected points = +1.2.

• A 15-yard gain moves the ball to the 40: expected points = +2.0.

• EPA = +0.8. The play improved the offense’s scoring expectation by 0.8 points.

Now reverse the outcome. A third-down interception can turn a positive scoring expectation into a negative one when the opponent takes possession. EPA captures that loss of value, not just the yards, or lack of yards, on the play. Exact values depend on the model and situation.

This is where EPA goes beyond the traditional box score. A three-yard gain on third-and-two typically adds value; the same gain on third-and-10 usually costs value. A long touchdown can produce a major positive swing, while a turnover can erase several productive snaps.

EPA measures the magnitude of scoring value. Efficiency measures how often the offense stays on schedule. A few explosives can lift EPA even when an offense struggles snap to snap. Conversely, an efficient offense can move the chains without producing enough explosive plays or finishing enough drives.

One important distinction: EPA is not win probability. It values scoring opportunities; it does not, by itself, answer whether a particular call maximizes the chance to win given the score and clock.

3. Toxic Differential: Who won the swing plays?

Toxic Differential = Turnover Differential + Explosive Play Differential

Turnover Differential is takeaways minus giveaways. Explosive Play Differential is explosive gains by your offense minus explosive gains allowed by your defense.

For explosive plays, a staff might use 10-plus-yard runs and 15-plus-yard passes. Some programs use different cutoffs. The specific threshold matters less than applying it consistently.

Suppose a team finishes with a +1 turnover margin and a +2 explosive-play margin. Its Toxic Differential is +3.

Why combine the two? Turnovers alter possession and field position. Explosives can bypass several downs of sustained execution. Both can change a game quickly, and both can make the final score look very different from the underlying down-to-down performance.

That doesn’t mean every explosive or turnover is luck. Pressure design, ball security, coverage leverage, tackling, and protection rules all influence them. But some outcomes, especially who recovers a loose fumble, can be volatile. Toxic Differential is most useful when it prompts the next question: Was that swing created by a repeatable advantage, a correctable breakdown, or a low-frequency event?

EPA already captures much of the value of turnovers and explosives. Toxic Differential isn’t a separate pile of points to add on top. It’s a way to see which types of plays drove the result.

When should coaches use each metric?

Series-to-Series: Lead with Efficiency

1. Diagnose the next decision. Between series, the job is not to grade the entire offense. It’s to identify what is working, what the defense is changing, and what play calls should come next.

Start with early-down Success Rate, then narrow the view: run versus pass, play family, personnel, formation, and, where charting allows, front, box count, and motion response. Track negative plays, too. One sack or tackle for loss can erase multiple successful first-down snaps. See how Modern Football is the only platform that provides true, real-time play calling input →

A useful live note sounds like this: “Split zone is keeping us on schedule. The overhang is triggering faster to the insert. Be ready for the glance or flat answer.” That’s actionable inside a play calling window. A page of statistics isn’t.

2. Use EPA as supporting context. Early-down EPA, drive-level value, and a view of major turnover or explosive swings help answer a different question: Are those successful snaps actually improving scoring chances? Keep the full EPA picture, but identify what is driving it. A single pick-six or explosive touchdown can dominate a tiny series-to-series sample.

3. Use Toxic Differential to interpret the scoreboard. If you’re down two scores because of giveaways, don’t assume the base offense is broken. But don’t dismiss the giveaways either. A tipped interception and a strip-sack caused by an unblocked edge rusher demand different coaching responses. Toxic Differential flags the swing; film and live charting identify the cause.

Series-to-Series priority: Efficiency → EPA context → Toxic Differential.

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Halftime: Efficiency Stays First

Halftime gives the staff a larger sample and a chance to test the assumptions behind the game plan.

Efficiency stays first. Check first and second-down success, run/pass and concept splits, negative plays, and whether the opponent’s adjustments are changing the picture. A favorable team-wide percentage means little if the defense has just changed its front or coverage rules. Recent behavior matters which is why Modern Football provides you with total in-game EFF and the efficiency of your last 15 plays.

EPA comes next. Look for the sources of scoring value and lost opportunity: early-down production, stalled drives, third-down failures, turnovers, and red-zone execution. Don’t let two explosives convince you that the offense is consistently winning its matchups. Likewise, don’t treat one turnover as proof that every preceding call was wrong.

Toxic Differential explains the gap. If the opponent’s points came from short fields and one busted coverage, the score may be a poor summary of normal-down performance. But the halftime adjustment should address the cause of that coverage failure, not simply hope the explosive margin evens out.

The best halftime discussion ends with a testable plan: What did we expect the defense to do? What has it actually done? What will we call to punish the next adjustment?

Halftime priority: Efficiency → EPA with context → Toxic Differential.

Post-Game: Evaluate value and whether it can hold up

After the game, the order changes. You have enough plays to examine the broader performance, though a single game is still a limited sample.

1. Lead with EPA. Evaluate EPA per play, by down, by run/pass and concept family, and by situation. Separate routine-down performance from the effect of turnovers, touchdowns, and late-game conditions. EPA helps show where the team created or surrendered scoring value, not merely where it accumulated yards. Modern Football's AI-powered Post-Game AI report turns your game data into actionable insights, highlights your strengths and weaknesses, and helps you make smarter decisions for your next game →

2. Validate with Efficiency. High EPA paired with high Success Rate suggests the offense combined steady execution with valuable production. High EPA with low Success Rate calls for a closer look at dependence on explosives. High Success Rate with modest EPA raises different questions: Did drives stall? Were successful gains too small? Did red-zone execution leave points behind?

These are film-study prompts, not automatic predictions. A low-efficiency, high-EPA offense may have a deliberate explosive-play structure. The question is whether its big-play opportunities and underlying matchups can be repeated against the next opponent.

3. Audit Toxic Differential. Chart how much of the result turned on takeaways, giveaways, and explosives. Then assign causes: coverage bust, poor pursuit angle, protection error, quarterback decision, successful pressure design, or a favorable bounce. That distinction is what turns a statistic into a practice emphasis and an opponent-specific game plan.

Post-Game priority: EPA → Efficiency → Toxic Differential.

The Coaching Cheat Sheet

The distinction is simple:

Efficiency: Did we stay on schedule?

EPA: How much scoring value did we create or lose?

Toxic Differential: How much did turnovers and explosives shape the outcome?

During the game, coaches need a fast, trustworthy diagnosis, not a retrospective report. After the game, they need a clear explanation of which advantages were real, which breakdowns were correctable, and which results may not repeat.

The right stat is the one that helps you make the right football decision at the right time.