C.40:5.3 - Let a mixed transfer change the target question

A target investigation requires comparison cases to share both setup and temperature regime. A source operation groups by setup alone. C.40.CD:5.1 carries the complete four-record case and the changed construction.

The original grouping returns T1–T2 and T3–T4. The target’s temperature condition rejects T1–T2. Adding temperature to the grouping retains T3–T4 for S2/warm and leaves no eligible S1 pair.

The result supports the narrower S2 comparison if useful. An S1 explanation needs comparable cases or a revised question; repeating the old grouping leaves that gap. The source operation retains its earlier qualified uses. The grouping establishes comparison eligibility, with causal explanation remaining a separate question.