 Gleason and Weintraub found that the parents rarely if ever explain to children the meaning of such routines as "Bye bye" or "Trick or treat"there was no concern with the child's thoughts or intentions as long as the routine was performed as expected at the appropriate times.Thus, parents' role in the acquisition of routines is very different from their role in most of the rest of language development.Gleason and Greif analyzed children's acquisition of three ubiquitous routines in "Hi, Thanks, and Goodbye