Here is a clip:
Allow for Failure
Your classroom should be a hot mess at first. Enjoy this, even relish it. Every time someone makes a mistake or something goes wrong, celebrate it like they did at the Apple Distinguished Educator Institute with an arm-raising “Woo Hoo!” Let kids know that failure is okay, and not everything will be perfect. Have fun with failure and messiness that might come from trying something new – it really is the fun part of the process. Another great article to read: Failure is Mandatory – Creating a culture of innovation
Here is the rest of the article that I highly recommend - http://www.edudemic.com/teachers-ipad-guide/