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Another recent innovation in mobile assessment mixes QR codes in with printed materials. The QR codes allow students to take a test regularly and receive immediate, constructive feedback as well as suggestions for review materials or additional resources (Lan, 2013). Two other recent innovations are assessment methods using automatic sensors (Trinder, 2012), and the use of the new Experience API (xAPI) and the concept of a learning records store (LRS) for recording and sharing of informal learning achievements.