Product Success Index · v0.3 · Log-Normalized Gain

The PSI Lab

An instrument for estimating whether value will actually be realized, not just whether it exists on paper. Three inputs. One reading. Four modes of inquiry.

Learning mode· v0.3 in active calibration · scores are decision input, not decision replacement
Formula
PSI = (Gn − P) / P × (1 + E/10)
Gn = 10·log₁₀(1 + G)
Inputs
Gain · Composite Value (raw)
30
0100
→ normalized: 14.91
Pain · Change Cost
5
110
Experience · Adoption
+2
-55
Field Note

Gain is composite (revenue, productivity, cost take-out) on any raw scale. Log normalization compresses it into the readable PSI band so deals of different sizes can be compared on the same axis.

Reading
2.38
Strong
High-confidence close. Focus on speed, not persuasion.
-201.536
Decomposed
PSI = (14.91 − 5) / 5 × (1 + 2/10)
where Gn = 10·log₁₀(1+30) = 14.91
= 1.983 × 1.20 = 2.379
Active Levers

∂PSI from a one-unit move in each raw input. Chain rule through the log keeps the Gain reading in raw-scale effort units.

Reduce Pain+0.716
Raise Gain (raw)+0.034
Improve Experience+0.198
Coaching Cue
High-confidence close. Focus on speed of execution, not persuasion. Tighten the close plan, surface decision-makers, set procurement on rails. Avoid over-engineering the value case.
Authored by Andrew Eriksen · Proprietary scoring framework · v0.3
PSI does not measure product value — it measures the likelihood that value will be realized.