Functional
Time to First Value
The absolute duration (typically in minutes) from signup to the first meaningful outcome.
Metric
TTV (Functional Velocity)
Completion of the specific behavioral event that correlates with long-term retention.
Metric
% Activated (Retention Correlation)
The instant the user realizes the product is worth it. Inferred from behavioral patterns.
Metric
Realized Fit (Psychological Buy-in)