UXD 104- imaging and data visualisation
principles for user interface concludes with the core guidelines of digital products are made and how efficient they are towards a working app or website. also this should be user friendly and should flow easily throughout the application.
some of these are as follows;

a touch screen should be around 7-10 mm to ensure usability and security when using a device and with these guidelines this will accommodates the users experience.
some examples are;