Module 2 · The Jev API · Lesson 4

Choice, Score and Noul

When to use each of Jev's three question primitives, how to write criteria, levels and yes/no questions that give reliable probabilities, and how to test a Choice for option-order bias.

70 min 1 video 3 exercises 7-question quiz Answers

Setup for the exercises:Python with uv Jev, or its local stand-in Install Claude Code

By the end of this lesson you can

Pick the right primitive (Choice, Score or Noul) for a decision, and recognise when a question belongs in code instead
Write Choice criteria with a full option list, an escape option and contrastive structured descriptions
Write Score levels that describe situations, read the expected score correctly and normalise it for composites
Phrase Noul questions with one condition and high = yes, and set thresholds in code
Test a Choice for option-order bias by rotating its options and measuring flips and probability spread

A client emails your conveyancing team: "The drainage search mentions a public sewer near the extension, and we're meant to exchange on Friday. Also, our bank has changed, so please use the new details below." Three things need deciding: what the enquiry is about, how urgent it is, and whether it contains a changed-bank-details request, the classic opening move of payment-diversion fraud. Each of those has a different shape. The topic is one of a fixed set, urgency is a position on a scale, and the fraud flag is yes or no. Jev has one primitive for each shape, and most of the reliability you will get from it comes from picking the right one and writing it well.

Choice, Score and Noul

When to use each of Jev's three question primitives, how to write criteria, levels and yes/no questions that give reliable probabilities, and how to test a Choice for option-order bias.

Choice, Score and Noul

Choice, Score and Noul

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