打招呼是任何文化中人際交往的起點。初踏入美國領士的外國學生，在這項行爲上總顯得很不自在而且被動。爲了改進打招呼的行爲，一位頗爲內向的中國留學生（作者本人）根據行爲自制技術，採用了一項N=1的密集A B A B F實驗設計，以本人為主試兼受試，以促進自我改變。此種改變技術强調認知心向的建立和從自我觀察中獲得囘饋。經過兩個時期的實驗處理後，發現受試者先打招呼的比率從．41顯著地增加到．69，互打招呼的絕對次數也大為增加。由此可見，先打招呼的行為，不難做到；經常為之，對於人際關係的增進，大有幫助。

New coming foreign students in the United States seemed to be uneasy to say hello. In order to improve, saying hello behavior, a Chinese graduate student conducted a N=1 intensive ABABF design to make self-change. Is was found that after 2 sessions of intervention, a cognitive set technique, the rate of saying hello first behavior was significantly raised from .41 to .69. It was concluded that saying hello first behavior is easily-to-be-performed and is resultful.