PE-301c · Module 1

Segment Decomposition

3 min read

An aggregate conversion rate is an average of segment-level rates. When the aggregate drops, the question is: did all segments decline, or did one segment drag down the average? Segment decomposition splits the pipeline by meaningful dimensions — lead source, industry, deal size, rep, product — and analyzes each independently. The segment that is declining is the segment that needs the remediation.

Do This

  • Decompose every conversion rate decline by at least three dimensions: source, segment, and rep
  • Look for mix shifts — even if segment-level rates are stable, a shift in volume toward lower-converting segments reduces the aggregate
  • Check whether the decline is broad (systemic issue) or narrow (segment-specific issue) before designing the remediation

Avoid This

  • Diagnose at the aggregate level and prescribe a one-size-fits-all fix — the problem may only exist in one segment
  • Assume a declining aggregate means every segment is declining — one underperforming segment can pull the average down
  • Ignore mix shifts — if 60% of your leads now come from a source with 15% conversion instead of 40%, the aggregate drops even though nothing else changed

The most common diagnostic surprise is the mix shift. Individual segment conversion rates are stable or even improving, but the aggregate is declining because the volume mix shifted toward lower-converting segments. This is not a conversion problem — it is a demand generation problem. The remediation is not sales coaching. It is reallocating marketing spend toward higher-converting channels.