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A few pain points in entering data comes from formatting dates and categorical columns.

When formatting dates, users tend to default to their preferred date format. This is an issue because there are many ways for the date to be written.

Categorical columns, such as the source of Bing or Google marketing campaigns, can be problematic because of naming convention differences between parties. In the world of marketing, different agencies usually have slightly different campaign names, but this issue can be mitigated by only offering a finite number of options to choose from.