propfessor.
LEARN AI FOR PROPERTY / SAMPLE LESSON

Catch the unsupported assumption.

Check an AI extraction before a missing value enters your model.

Begin the lesson
Missing is not zero.
SOURCE EXCERPT

“Annual rent: £180,000.
Lease term: five years.”

Annual rent£180,000Stated
Lease termFive yearsStated
Rent-free monthsNot statedNeeds checking

A source gap needs checking. Never silently fill it with zero.

AI for property / document extraction and human checking.

01
THE IDEA TO UNDERSTAND

A missing assumption is not zero.

Invented source excerpt: “Annual rent: £180,000. Lease term: five years. Rent payable monthly.” The excerpt says nothing about rent-free periods.

HOW IT WORKS

Not on the strength of this excerpt. It supports the annual rent and term, but it does not state the rent-free period. Record that field as “not stated in the supplied excerpt” and check the relevant lease material before using a number. An empty source field is not evidence of zero.

The method you will practise

  1. Require each extracted value to carry a supporting excerpt or a clear “not stated” flag.
  2. Keep directly stated facts separate from derived figures and unresolved fields.
  3. Review the relevant source material and resolve the gap with the responsible person before using the assumption. A citation still needs checking against its source.

AI for property / document extraction and human checking.

02
THINK IT THROUGH

The summary says nothing about rent-free months. Is “0” a supported extraction?

Choose what you expect. The feedback will help you test your starting idea.

03
YOUR TURN

Review two possible extraction outputs

Compare the cases below. Notice what changes, then read the explanation of why.

WHY THIS HAPPENS

A fictional extraction exercise, not a lease interpretation or a claim about a particular AI provider.

04
CHECK WHAT YOU UNDERSTAND

An AI reply now cites the same short excerpt beside “0 months”. What changes?

Choose your next action
Give me a hint

Require each extracted value to carry a supporting excerpt or a clear “not stated” flag.

05
TAKE THE SKILL INTO YOUR WORK

Now try it in your software.

For a permitted, non-confidential practice document, require each extracted field to include supporting words or “not stated”. Keep derived calculations separate from directly stated facts. This is a fictional extraction exercise, not lease interpretation.

WHAT YOU SHOULD BE ABLE TO EXPLAIN

You can prevent an unsupported AI answer from silently becoming a model assumption.

Need help with your own example?

The Companion is where you ask about the task on your screen. Include your software version, what you changed and the result you expected.

Read this module’s Companion example

This sample checks your reasoning here. It cannot inspect or certify your work in another application.