Block bad data, duplicates, and incorrect dates with these custom rules.

Excel's data validation feature is more versatile than you might think. Learn how to use literal values, input values, list values, and even formulas to restrict input date values using data ...

When multiple data variables are accommodated in a project, the time and spatial grids of those variables must be identical. As such, you must control the data other people enter. That’s when you need ...

Advanced list solutions are easy thanks to Excel's Table object. If you need a dynamic list, try one of these techniques. The article Five ways to take advantage of Excel list features showed five ...