Iris recognition technology requires reasonably controlled and cooperative user interaction - the enrollee must hold still in a certain spot, even if only momentarily. Many users struggle to interact with the system until they become accustomed to its operations. In applications whose user interaction is frequent (e.g. employee physical access), the technology grows easier to use; however, applications in which user interaction is infrequent (e.g. national ID) may encounter ease-of-use issues. Over time, with improved acquisition devices, this issue should grow less problematic.