Technology is not magic and does not automatically make a powerful learning experience unless it is used with good teaching and curricula. It is not usually a good idea to simply replace a traditional lab with an equivalent one using handheld computers and/or sensors. This kind of "substitution" is easiest to implement, but can simply make a lab more difficult and expensive by the inclusion of technology with little educational gain. Handheld computers and sensors add capacity and flexibility that, to be exploited, requires the activity to be reconceptualized, giving students more opportunity to explore and learn through their investigations. This, in turn, often requires a change in teaching style that takes time and institutional commitment. These changes are central to the reform envisioned by the new standards and curriculum frameworks.