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With Option Explicit enabled, any unrecognized words will cause a compile error to be thrown, indicating the offending line. Without Option Explicit enabled, any unrecognized word will be assumed by the VBA compiler to be a new variable of the Variant type, causing extremely difficult-to-spot bugs related to typographical errors. Option Explicit requires that every variable has to be defined before use, e.g. the code of Sheet1 before activating the option "Require Variable Declaration", Option Explicit will not be added! Small note: This is true for the modules, class modules, etc. Selecting this option will automatically put Option Explicit at the top of every VBA module.

Then in the "Editor" tab, make sure that "Require Variable Declaration" is checked: In the VBA Editor window, from the Tools menu select "Options": # VBA Best Practices # ALWAYS Use "Option Explicit" Avoid re-purposing the names of Properties or Methods as your variables.WorksheetFunction object executes faster than a UDF equivalent.Avoid using ActiveCell or ActiveSheet in Excel.Always define and set references to all Workbooks and Sheets.Switch off properties during macro execution.Creating a drop-down menu in the Active Worksheet with a Combo Box.Methods for Finding the Last Used Row or Column in a Worksheet.Use Worksheet object and not Sheet object.Loop through all Sheets in Active Workbook.