We summarize our explanation on the four efforts indicated below by citing that the interpreter can easily do his job in an area of simultaneous interpreting if he perfectly masters the four efforts: listening and analysis effort, effort of understanding, effort of memory (short term and long term) and effort of speech production, since one is complementary to the other. This means that the interpreter first intensifies his effort to listen and analyze the speaker's speech in order to understand the exact meaning of the message. In addition, we emphasize the importance of the performer's memory in storing information when receiving the message through sensory systems. Moreover, the memory helps the interpreter analyze and understand the speaker's meaning with a view to only reformulating the meaning of the message by producing the most appropriate mold for the speaker's message. And then the interpreter faithfully transmits it to listeners from a source language into the target language..