time lag refers to the time between the interpreter's reception of the speaker's utterance and his/her production. It is ear-tongue or hearing-voicing span. Time lag varies according to the nature of the SL message and the number, type and intensity of the aforesaid constraints. For example, the syntactic and lexical complexities and the pile-up of information segments may oblige the interpreter to lag behind the speaker to get a clear understanding, or at least the gist,