--- title: How Excel is Failing Your Tolerance Stacks | DCS description: Excel Stack-Ups do not include influences from 3D part associations, nor does it include process variation, that can greatly impact a design causing high costs to correct in scrap, rework and recalls. This means that your Excel answers might be misleading you, and can cause some embarrassing, and expensive, problems later on. image: https://mkt.3dcs.com/hubfs/2d-stack-up-orientation-form-tolerances.png --- SEARCH [![](https://www.metrologicdcs.com/wp-content/uploads/logo-metrologic-dcs-mono.svg)](https://www.metrologicdcs.com/) [Get Started ](https://www.3dcs.com/contact-dcs/headquarters-dcs) Search Search # How Excel is Failing Your Tolerance Stacks 1D vs 2D vs 3D Tolerance Analysis Explained Excel is great for quick stack-ups, but misses a large portion of the variation ### Watch the Full Webinar DCS will never share your information with a third party or add you to a mailing list without permission. Read our [privacy policy to learn more](http://www.3dcs.com/dcs-privacy-policy) about how DCS protects your information. ### Compare 1D vs 2D vs 3D Takeaways: - What variation is missed in Excel 1D stacks? - What does 3D analysis offer? - What is the empirical evidence for 3D Stacks? ### Why Worst Case isn't the Answer Takeaways: - Why Worst Case doesn't make sense - When Worst Case DOES make sense (safety!) - How likely is True Worst Case  ### Why Bother with 3D Analysis? Takeaways: - Inputs and Outputs of 3D analysis - What other benefits from making a model - What do you learn from making a 3D analysis Learn WHY Excel stacks leave you short on answers and long on costs ![](http://www.mown5gaze.com/146929.png)