User centered design (short UCD, sometimes called Human centered design) emphazises focus on end users of a product and aims to test and develop products in close interaction with users.

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Is OTP (one time password) the best way to authenticate a user?

Are one time passwords the best way to authenticate a user when he/she logs-in the first time in a mobile application? Or are there better ways to authenticate a user in terms of user experience?
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Recommended IA and Navigation Architecture for a single long page scroll?

Website with several pages functioning as a long page scroll determining the optimal navigation architecture. Are there any general usability suggestions for content rich websites with pages designed ...
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Research CALL (Computer-Assisted Language Learning) with mobile devices

I am looking for more researches on this particular use of technology. If anyone know similar cases or studies about, please, share with me! In the meantime, thank you so much for your attention and ...
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Is it better to include cart view as 1st step of checkout?

We are trying to optimize on the checkout flow of our mobile app. This is the current flow of our app User adds product to cart > goes to cart page > clicks to start checkout it's a 3 step ...
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Help regarding creating an interface for privacy settings

I have create a demo interface/solution so that users of Facebook, Twitter and Flickr can manage their privacy settings in all three of these networks easily. It could be something like Hootsuite. ...
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UI for selecting multiple records with multiple cases

The title may not suffice to describe the nature of my problem here. But to describe, i'll give my data model and the current UI used to implement it. The tables and relation : 1) I only have two ...