* Have QWERTY keyboards: These allow for more extensive text input and potentially access to external information or stored formulas, violating the test's integrity.
* Can perform symbolic manipulation (CAS): These calculators can solve equations algebraically, effectively doing the problem-solving for the student. The ACT aims to assess the student's understanding of mathematical concepts, not their calculator's abilities.
* Make noise: This is simply to maintain a quiet testing environment for all participants.
* Have paper tapes or other means of storing or displaying information beyond the screen: This prevents students from cheating by referencing previously worked problems or storing formulas.
In short, the ACT's calculator policy is designed to ensure a fair and equitable testing environment where students are assessed on their individual mathematical skills and understanding, not their access to advanced calculator functions.