What are common reasons for a 'ModuleNotFoundError' even after successful installation?

Common reasons include: 1. Multiple Python installations on your system, and your script is using a different Python interpreter than the one used for installation. 2. Using a virtual environment that is not activated when running your script. 3. Incorrectly installing the module (e.g., to a user-specific directory that isn't in the Python path). 4. IDE configurations pointing to the wrong Python interpreter. 5. Case sensitivity issues in module names (though less common for standard installations).