 It is worth noting the existence in the literature of another practice with the potential to mislead the unwary. (Although, unlike the terminological practices complained about above, this one is in itself perfectly acceptable.) In technical material, including textbooks, the word ‘computable’ is often tied by definition to effectiveness. Thus a function is said to be computable if and only if there is an effective method for obtaining its values. If ‘computable’ is used in this way, then the maximality thesis can be stated more simply: All functions that can be generated by machines (working in accordance with a finite program of instructions) are computable.