John D. Cone Books

Evaluating Outcomes
Evaluating Outcomes

By John D. Cone

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"Evaluating Outcomes is designed to help psychologists and related service providers determine their effectiveness in a reliable way and demonstrate that effectiveness to others. John D. Cone provi...

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The Pyramid Scales
The Pyramid Scales

By John D. Cone

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What is an EAN and How Does it Relate to an ISBN?

If you’ve ever purchased a product online or in a store, you’ve likely come across a barcode. Behind these barcodes lies a standardized system that makes modern commerce possible. Two key codes often encountered are the EAN (European Article Number) and ISBN (International Standard Book Number). But what are they, how are they connected, and why are they so crucial? Let’s explore.

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