Each time a new device is launched, whether it is a tablet, an e-reader or a mobile phone, it is automatically compared with its predecessors and, of course, with its competitors. Manufacturers make an effort to make devices increasingly usable, convenient and intuitive, following the guidelines established by Jakob Nielsen, the usability guru.

According to Nielsen, the general trend in mobile phones is for increasingly lightweight devices, with larger screens and easy-to-use keyboards. Tablet users are demanding the same features. In our opinion, the IPad 2, Samsung Galaxy Tab 10.1 and Sony Tablet are good examples of enhanced usability:

• iPad 2: it weighs 600 grams and is only 0.88 cm thick. Its Dual Core A5 integrated processor makes it faster than its predecessor. Its graphic performance is up to nine times greater than that of the first iPad. It also includes the Facetime function, which enables us to talk to and see our contacts at the same time, and a gyroscope, something like a motion sensor, which provides much more precision when playing games on the device.
• Samsung galaxy Tab 10.1: tablet with a 10.1” touch screen. It has not buttons because everything is done on the screen, so it can be used to watch high definition videos, see photos or play games. This device comes with the latest version of Honeycomb for Android system tablets, guaranteeing that it is very easy to use.
• Sony Tablet: Sony has launched two tablets: Sony Tablet S and Sony Tablet P. The latter was designed with video games in mind. It has two 5.5” screens and is the first tablet with PlayStation certification. The S model has a 9.4” LCD screen and weighs 580 grams. It includes the Android Honeycomb 3.2 operative system and DLNA technology, to control other electronic equipment through the tablet.

The tablets like these, which follow the guidelines established by Nielsen with regards to dimensions and features, are the most appreciated by users and therefore the best-selling options on the market.