The Detective’s DeskXena Bell
Recorded account
“I used 500 millilitres plus 250 millilitres and reached the fill line exactly.”
MEDIUM · CASE FILE
A label in the wrong unit
Medium · FERN BOTANICAL STORE
Four gardeners each claim their measured water will fill one marked flask exactly. Use the mixing note and the flask mark to test their accounts. 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
Whose exact-fill claim is impossible?
- 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
Umi Hart
Recorded account
“I used 75 millilitres and reached the fill line exactly.”
Vera Oak
Recorded account
“I used 750 millilitres and reached the fill line exactly.”
Wes Reed
Recorded account
“I used 0.75 litres and reached the fill line exactly.”
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
Shelf allocation
All flasks belong on shelf F after use.
Shelf assignment gives no volume information.
PRIMARY RECORD
Flask mark
Every empty flask in this order holds exactly 0.75 litres to its fill line.
This gives capacity in litres.
LINKED RECORD
Measure conversion
For this file, 1 litre equals 1000 millilitres. The amounts in the gardeners’ accounts were measured accurately.
This lets every account be compared in the same unit.
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 Wes Reed 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.
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 “Flask mark” 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.
Questions to resolve
Match every recorded item to its handler or reviewer.
- Flask mark
- Measure conversion
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.