The Nielsen Norman Group (NN/g), a user experience firm founded by usability gurus Jakob Nielsen and Don Norman, has appraised iOS 7, and the verdict isn’t great. “Early experience with applications redesigned for iOS 7 is fairly negative: several have worse usability than their iOS 6 versions.” In particular, NN/g cites action labels that are indistinguishable from content, the confusing date picker, confusing swipe actions (for example, activating Notification Center when you wanted Spotlight), and the redesign of many icons, of which NN/g said, “Apple has demolished millions of hours of user learning by changing the icons.” However, NN/g said that iOS 7’s design isn’t fatally flawed, and praised how controls are hidden in Safari, global font size controls, and the streamlined Settings app.follow link
View Extra Audio Details in Snow Leopard
In Snow Leopard, Option-clicking the Volume icon in the menu bar displays a list of sound input and output devices. Choose one to switch to it; it's much easier than using the Sound preference pane. Also, hold Shift and click the icon to set the system volume, which is separate from the general output volume.
Nielsen Norman Group Slams iOS 7