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Subtext is a free iPad app that allows classroom groups to exchange ideas in the pages of digital texts. You can also layer in enrichment materials, assignments and quizzes—opening up almost limitless opportunities to engage students and foster analysis and writing skills.

Students should sign a release for BYOD that includes what will happen in cases of theft and damaged technology Schools should have half-sets or quarter-sets of devices so that they can go one-to-one. A few school-wide behavior guidelines make sense: Devices away when the teacher is talking (unless instructed to do so) During individual assignments, students can use devices and have their headphones on Students need to use the devices for the purpose of learning and a teacher can require a student to put it away if it becomes a distraction Teachers can attend optional training on apps, classroom management and how to integrate the tools into the curriculum. One group had the idea of letting teachers watch a BYOD class in action, or even having a “test class” that tries it out for a quarter before going school-wide.

When my 2nd grader needs to know the meaning of a word, I tell him to use my iPhone to ask Siri, an artificial intelligence program that's always happy to look it up for him. Siri, in turn, uses the free online program Wolfram Alpha, one of the most powerful data analysis tools in the world. If you enter into the Siri (or Wolfram Alpha) search box, by text or voice, "arable land in world divided by world population," in less than a second the phone or computer will find the relevant data; do the calculations; provide the answer—in square miles, acres, square feet, and hectares per person—and cite you its sources.

With YouTube, for example, students can post their ideas to the world and get rapid global feedback. With tools like Twitter and its cousins, they can follow firsthand details of events unfolding anywhere in the world, from revolutions to natural disasters. With mashups and related techniques, they can combine sophisticated data sources in powerful new ways. One school group I know of created a Second Life model of Los Angeles, using the database of the Federal Aviation Administration (FAA) to show each plane flying in its actual spot! With Skype-like tools, students can connect with experts and peers around the world in real time.

call the process of envisioning such technically enhanced possibilities imag-u-cation. It's something every teacher and class should spend some time doing.