How to use data validation in Excel 2007: Entering correct data into Excel sheets is crucial to any work in calculations or analysis in excel. Data validation provides an excellent tool to make data entry easy, accurate and quick. You can validate text, numbers, functions and custom functions using the data validation feature. Using lists, boundaries of numbers, text length limitations and even custom criteria, you can ensure that the data entry operator makes lesser mistakes. Also by providing visual messages you can guide the operator. Finally if the user makes a wrong data entry he gets an attention grabbing message which informs him about how to follow the data entry instructions and that the data he entered does not match the specified parameters!
