> In 2015, when I see and use software that doesn't subtly prompt the user to undo actions for a short period of time after an interaction I just shake my head.

> In 2015, when I see and use software that doesn't subtly prompt the user to undo actions for a short period of time after an interaction I just shake my head. Subtly prompting is not enough, keeping a recycle bin or undo-stack is much preferable. The android photo app is a great example of this. By sliding right or left you move to the next/previous photo. By sliding the photo up you delete it and then move to the next photo! The only notification of this is a subtle prompt at the bottom of the screen: "Photo deleted - Undo?" I gave my tablet to my mom to browse through photos, guess what she did to browse to the next photo: swipe up. She didn't notice the subtle prompt at the bottom of the screen and ended up deleting half of my photos before she noticed it, by then it was too late as the undo only worked one step back. Luckily i had the photos stored elsewhere also.