Senior Product Designer @Fitbit, writing about product design and psychology. http://davidteodorescu.com

How our decisions are influenced by other people and why that should be a good thing.

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How to build a gamification system the right way and how Fitbit, Waze, and Duolingo use it to enhance their products.

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  • a fun group — when I was allowed to play games or eat chocolate
  • a serious group— when I had to go to school or eat greens (the horror!)


Short analysis on the current state of affairs and a few tips to keep in mind.

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An essential guide for efficient UX and product designers on why, when and how to create and manage a Terms and Statements Inventory document.

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A sketch representing the connection between terms and statements


Why experiences require speed of use alongside ease of use.

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Speed of use is a usability trait describing the minimal timeframe in which users accomplish a given task. This includes the actions that lead to the task but also the time it takes users to recover from errors.


An overview on the implications of integrating the Endowed Progress Effect into the task design of any UX process.

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What is the Endowed Progress effect?

In other words, users are more likely to complete a task if they are provided with an artificial progress towards the task.


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What is priming?

Where does it come from?


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This almost simple, however, is basically the difference between using it and not using it. …


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Adding a reminder, using Google, is just not doable. That’s because there are too many ways to do that and all of them are flawed by really annoying tiny details.

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