01
Evidence on its own does not describe a situation.
A single report or observation states a single fact. Reading what is happening requires the evidence about the same subject and the same time to be placed together. When evidence is scattered, people rebuild the picture in their heads, and that work leaves no record.
PÓLYA takes evidence whose source and timing HARBINGER has verified and weaves it into one picture of the situation. Each piece keeps its source and timing, so any part of the picture can be traced back to the evidence behind it.
02
Corroboration, conflict, and gaps, shown together.
When different sources say the same thing, they corroborate. When they say different things about the same subject, they conflict. What needs to be known but has no evidence yet is a gap. Showing only one of the three makes a picture look more certain, or less certain, than it is.
PÓLYA does not remove or average out a conflict. It keeps visible which evidence conflicts with which, and marks a gap as a gap. Visible conflicts and gaps decide what to check next.
03
People choose the interpretation.
The same picture can be read more than one way. Which of two conflicting reports to accept, and whether to proceed while a gap remains, is decided by the responsible person. PÓLYA does not choose the interpretation. It sets out the picture that choice requires.
New evidence changes the picture. PÓLYA keeps what changed from the previous picture: which conflicts were resolved and which gaps opened. Comparing options on the basis of the picture is the work RAIFFA takes up.