Every ranking in the EDAC programme is built on a single measurement: your SAC score. Understanding what SAC measures — and how the three dimensions combine into your EEI — is the foundation for using the system effectively.
The Three Dimensions
Speed is how quickly you process information and produce a response. Not raw reaction time — the nerve-conduction gap between a signal and a movement. Decision speed: the time between receiving a complex perceptual stimulus and selecting the correct response. This is cognitive processing speed, and it is the dimension that most directly reflects the neural efficiency research underlying the EDAC framework.
Speed alone is insufficient. A player who responds instantly but incorrectly is not performing well. Which is why Speed is always measured alongside its counterpart.
Accuracy is whether your responses are correct. In the SAC context, accuracy measures the quality of your decision-making — not whether your foot position was right, but whether you identified the right option from the information available. It is a measure of perceptual-cognitive precision.
High speed with low accuracy means you are fast but noisy. High accuracy with low speed means you are correct but slow. Neither is optimal. The framework measures both independently before combining them.
Consistency is the dimension that most distinguishes genuine skill from lucky performance. Consistency measures how stable your Speed and Accuracy are across repeated, varied situations. A score that varies dramatically across the assessment — fast in some situations, slow in others, accurate under low pressure but degraded under high pressure — reflects a cognitive pattern that hasn’t been fully integrated.
Consistency is also the dimension most resistant to short-term performance fluctuation. A player can have an unusually fast session or an unusually accurate one. Consistency is harder to fake, because it requires sustained performance across the full assessment environment.
How SAC Combines Into EEI
Your EEI (Evolver Edge Index) is a composite score derived from your SAC dimensions. The calculation weights all three dimensions, with Consistency carrying additional weight because of its predictive value for sustained performance.
The EEI is expressed on a normalised scale relative to the player population in your age band and assessment tier. This means your score tells you not just what you achieved in absolute terms, but where you stand in the distribution — your percentile ranking against comparable players.
Performance bands within EEI:
- Emerging — building foundational cognitive-technical patterns
- Developing — competent processing with room for speed or consistency gains
- Performing — above-average cognitive efficiency for your age band
- Elite — top decile performance within your tier
What SAC Doesn’t Measure
SAC is an honest framework, which means being equally clear about what it doesn’t measure.
SAC measures cognitive-technical decision-making in the EDAC assessment environment. It does not measure on-pitch performance, tactical intelligence in full match contexts, technical execution quality, physical attributes, or football intelligence as a whole. These are separate dimensions of a complex game.
Your SAC score is a specific measurement of a specific capability. It is designed to be precise and actionable — not a complete portrait of a footballer.
Important: The SAC score and EEI are distinct from the EVO Score. The EVO Score is measured in a different environment with different conditions. They are related frameworks — both built on the same principles — but they are not interchangeable. Read more about the difference →
Why This Matters
The value of a SAC score is that it gives you a target. If your Speed is in the top quartile but your Consistency is in the bottom half, you have a specific, actionable direction for development. If your Accuracy is high but your Speed is limiting your EEI, you have a different programme priority.
Measurement without direction is just data. SAC is designed to produce both.
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