[ Framework Metric ]
CTS: Cohort Transfer Slope.
A slope for how PictoClarity Score changes across modeled birth cohorts.
Definition
CTS measures the rate of PCS change across modeled birth cohorts in the current evidence window.
Core Idea
Recognition is not transfer.
Recognizing a symbol does not imply successful communication of the intended meaning or action.
[ How To Read It ]
What The Metric Measures.
The reading applies to the submitted pictogram, expected message, user group, and evidence window.
Whether clarity decays sharply or remains stable across cohorts.
How fast a learned convention loses transfer reliability.
Whether a pictogram needs cohort-specific support or replacement.
High Reading
A high CTS means clarity changes materially across cohorts.
Low Reading
A low CTS means the modeled transfer profile is comparatively stable across cohorts.
[ Limits ]
What It Does Not Claim.
CTS should be compared inside the same evaluation context.
CTS can flatten when evidence is sparse or when cohort signals are weak.
CTS summarizes the modeled curve; it does not explain every local variation.
[ Examples ]
How It Appears In Reports.
A legacy interface metaphor can show a stronger CTS when younger cohorts lose direct object familiarity.
A simple restroom pictogram can show a lower CTS when recognition remains stable across cohorts.
[ Related Metrics ]