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You've never seen this dataset before. Everyone wants a chart from it by this afternoon.
What you'll have at the end
A written first-look note: the row count, which columns are missing data and why, and the two or three findings that would actually change today's requested chart.
You need
A table or export you have not opened before, the ability to run queries against it, and a clear enough idea of what's being asked of it today, such as a specific chart or number, since the last part of this pass is judged against that exact request.
Not covered
Fixing anything this pass turns up, from a missing-value rule to a duplicate-row decision to a capitalization cleanup: this pass only decides what needs fixing, never does the fixing itself.
Leans on
Standardize a status column so every capitalization spelling counts as one value
when the top-values scan turns up a capitalization split like this pass finds, go there to collapse it into one value.
The missing-value rule nobody wrote down for this column
when a missingness pattern like the one this pass finds needs a documented team rule for what to do about it.
Check a column's distribution before it hides a bug
when this pass's quick min, max, and median scan on one column isn't enough and it needs a full plotted shape investigation.
Checked 26 Aug 2026
Part of the Data Analytics cookbook