← VCE Data Analytics U4O1

Clarifying data refresh requirements

Statements of how often, how and by whom the data behind a dynamic visualisation is updated, e.g. a daily automatic refresh from the data source.

Part of: VCE Data Analytics - U4O1 - Development and Evaluation — Module 64

Understanding Clarifying data refresh requirements in VCE Data Analytics U4O1

What it does: This states how the refresh happens (automatically) and which data source and connection it uses. A clear refresh requirement states how often (daily at 6 am), how (automatic) and from where (the sales database). 'Up to date somehow' is too vague to test. The frequency should match how quickly the data changes and how quickly decisions are made. Yearly updates would leave the canteen with out-of-date figures. A 'last updated' stamp does not change the refresh speed. It tells viewers how recent the data is so they can judge whether to rely on it.

Common mistakes: The refresh is scheduled and owned by the system, so the method must be automatic. A manual method contradicts the schedule. It should be 'Method: automatic'. A live bus times dashboard must be refreshed often. 'never' is not a usable frequency and means the data would go stale. It should be something like 'Frequency: every 1 minute'.

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Learning
Duo
Which is a clear refresh requirement for a dashboard?
The dashboard should be kept up to date somehowData refreshes automatically every day at 6 am from the sales database
Matches
Refresh: when needed
↓
The requirement is vague. It gives no frequency, method or person responsible, so no one knows when the data is updated.
Applying
Meanings
Term
refresh requirements
Meaning
Statements of how often, how and by whom the data behind a dynamic visualisation is updated, e.g. a daily automatic refresh from the data source.
Practice
Frequency: daily at 6:00 am
Testing
Gaps
="Last updated: "&TEXT((),"dd/mm/yyyy")
Check Answer
Spots
2Frequency: every day at 6am
3Method: manual

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Quick Questions

1. Which is a clear refresh requirement for a dashboard?
A. Data refreshes automatically every day at 6 am from the sales database ✓
B. The dashboard should be kept up to date somehow
A clear refresh requirement states how often (daily at 6 am), how (automatic) and from where (the sales database). 'Up to date somehow' is too vague to test.
2. A school canteen dashboard must show today's sales by lunchtime. Which refresh frequency suits it best?
A. Refresh every hour during the school day ✓
B. Refresh once a year
The frequency should match how quickly the data changes and how quickly decisions are made. Yearly updates would leave the canteen with out-of-date figures.
3. Which statement describes a manual refresh?
A. A named staff member clicks Refresh to load the latest data ✓
B. A scheduled task loads new data without anyone clicking
A manual refresh needs a person to start it, so the requirement should say who is responsible. A scheduled task with no one clicking is an automatic refresh.
4. Which refresh requirement names the data source and connection?
A. Refresh from wherever the data is stored
B. Refresh from the linked Google Sheet of student survey results ✓
Refresh requirements should identify the data source and how the visualisation connects to it, such as a linked sheet or database. 'Wherever' does not tell the developer what to connect to.
5. Why include a 'Last updated' date and time on a dashboard?
A. It makes the data refresh faster
B. It shows users how current the data is, so they can trust it ✓
A 'last updated' stamp does not change the refresh speed. It tells viewers how recent the data is so they can judge whether to rely on it.

Match the Pairs

Refresh: daily at 6:00 am → A frequency statement that says how often the data behind the dashboard is updated
Last updated: 14/03/2025 6:00 am → A label that shows users when the dashboard data was last refreshed
A refresh requirement can state that the update is automatic and linked to a data source connection → Refresh: automatic from the sales database
A refresh requirement can state who is responsible for a manual refresh → Refresh: manual, by the data analyst each Friday
Refresh: when needed → The requirement is vague. It gives no frequency, method or person responsible, so no one knows when the data is updated.
Refresh: automatic, by the teacher each week → The requirement contradicts itself. An automatic refresh runs without a person, but it says a teacher does it, so the method is unclear.

Key Term

refresh requirements
Statements of how often, how and by whom the data behind a dynamic visualisation is updated, e.g. a daily automatic refresh from the data source.

Fill in the Blanks

1. ="Last updated: "&TEXT(NOW(),"dd/mm/yyyy")
Hint: Type the spreadsheet function name that returns the current date and time, so the dashboard can show when it was last updated.
2. refreshMode = "automatic" # runs by itself
Hint: Type the refresh type where the data updates on a schedule without a person starting it.
3. refreshFrequency = "daily" # once per day
Hint: Type the frequency word that matches how often the comment says the refresh happens.
4. dataSource = "sales.csv" chart.connectTo(dataSource)
Hint: Type the variable name defined on the first line that holds the place the chart gets its data from.
5. refreshMode = "manual" # user clicks Refresh
Hint: Type the refresh type where a person must start the update themselves.

Spot the Error

Question 1
A Dashboard: Daily Sales
B Frequency: every day at 6am
C Method: manual
D Owner: system schedule
Line C — The refresh is scheduled and owned by the system, so the method must be automatic. A manual method contradicts the schedule. It should be 'Method: automatic'.
Question 2
A Dashboard: Live Bus Times
B Source: transport database
C Frequency: never
D Method: automatic
Line C — A live bus times dashboard must be refreshed often. 'never' is not a usable frequency and means the data would go stale. It should be something like 'Frequency: every 1 minute'.
Question 3
A Dashboard: Weather Station
B Connection: none, typed in
C Frequency: every 10 minutes
D Method: automatic
Line B — An automatic refresh every 10 minutes needs a connection to the data source. Typing data in by hand is not a connection. It should be 'Connection: link to weather API'.
Question 4
A Method: automatic, by officer
B Frequency: every Monday
C Responsible: data officer
D Display: last updated date
Line A — If a data officer does the update, the method is manual. 'automatic' and 'by officer' contradict each other. It should be 'Method: manual, by officer'.
Question 5
A Dashboard: School Attendance
B Source: attendance.xlsx
C Frequency: every Friday
D Display: hide last updated
Line D — Refresh requirements should show a 'last updated' date so users know how current the data is. Hiding it removes that. It should be 'Display: last updated date'.

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