 Andy Hargreaves and Dennis Shirley write that while there are advantages in students being able to access information instantly on-line, one should not mistake such processes for "something deeper, more challenging, and more connected to compelling issues in their world and their lives".Alfie Kohn wrote that while personalized learning may sound like a useful strategy for education, in practice it's mostly just about selling technology products.Personalized learning promises a strategy to specifically adjust education to the unique needs and skills of individual children, he argued, but really it means merely "adjusting the difficulty level of prefabricated skills-based exercises based on students' test scores... [and] requires the purchase of software from one of those companies that can afford full-page ads in "Education Week"".