The Detective’s DeskVenn Hart
Proposed deduction
“The shortest available walk is 5 minutes.”
MEDIUM · CASE FILE
The closed arcade
Medium · NORTHBRIDGE MARKET
Four runners calculated the shortest possible walk from the station to the square. The temporary closure must be respected. Also reconstruct the review register: it records who examined which source, independently of whether their later proposed answer is correct. Review slots describe order, not travel or clock times.
Read the case file below, or open the interactive desk to examine records, keep notes and submit your reasoning. These are the case materials, without the solution.
Your assignment
Who found the shortest available journey?
- The analytical records answer the analytical question; worksheet records establish the review reconstruction. Candidate proposals and supplementary recollections are claims to test.
- There are 2 ordered events. Use each listed person and item once in its column. “A immediately before B” means A is in the row directly above B, with no row between them.
- 4 verified records support the complete submission. Keep the separate context note out of the proof.
- No outside facts or unstated exceptions are required. The complete board and report are assessed together.
People and accounts
Willa Dean
Proposed deduction
“The shortest available walk is 10 minutes.”
Xavi Moss
Proposed deduction
“The shortest available walk is 7 minutes.”
Uma Reed
Proposed deduction
“The shortest available walk is 9 minutes.”
Case records
Read each record on its own terms. A claim made by a person is different from a fact established by an independent record.
CONTEXT NOTE
Market stall list
The square holds stalls selling bread, paper and flowers.
The stalls do not change the network or the closure.
PRIMARY RECORD
Walking network
The complete two-way network is Station–Arcade 3 min; Arcade–Square 2; Station–Canal 4; Canal–Square 5; Arcade–Canal 2. Times are exact walking durations.
This supplies every route and edge duration.
LINKED RECORD
Arcade barrier
The Arcade–Square connection is closed for the entire journey. Every other listed connection is open.
This removes the otherwise fastest connection.
RECONSTRUCTION RECORD
Review register
This is the same investigation’s document review record. There are 2 ordered events, labelled Review 1, Review 2. Each listed person and item occurs exactly once. These slots describe record order, not times from the analytical problem.
- The event reviewed by Willa Dean occupies slot 1 (Review 1).
Use each column’s choices exactly once. Verified relationships govern the board; proposed answers and later recollections do not override them.
RECONSTRUCTION RECORD
Review cross-check
The relationships below were verified independently. “A immediately before B” means A is in the row directly above B, with no row between them. Keep relationships from all worksheet sources together.
- The event involving “Walking network” occupies slot 2 (Review 2).
Use each column’s choices exactly once. Verified relationships govern the board; proposed answers and later recollections do not override them.
Questions to resolve
Match every recorded item to its handler or reviewer.
- Arcade barrier
- Walking network
When was the primary analytical record reviewed?
Use the interactive case desk to select your finding and cite the records that support it. The answer is checked there, and your progress stays in your browser.
Build your finding
Compare the records with each account. Work out what the evidence establishes, then separate that finding from anything it does not prove.