Schlesinger(1971a,1971b)の提出した発話文法を検討するために,2つの研究が行われた。第1の研究(研究I)では,2歳1月から2歳8月までの一人の男児の連語が分析され,次のようなことが明らかになった。語順の一般的傾向はSchlesingerの文法を支持していなかったが,ある動詞ではその動詞独自の語順が認められた。第2の研究(研究II)では,2歳5月から3歳9月までの,5人の子供の発話が分析され,次の点が明らかになった。5人の子供の総合的な語順傾向はSchlesingerの文法を支持していたが,個々の子供の結果は,必ずしもSchlesingerの文法を支持していなかった。

Developmental psycholinguistic investigation based on the Chomsky's generative theory (1957) has two purposes: 1. to record and analyse the utterances by child for the purpose of clarifying his competence. 2. to present the generative grammar adequate to competence. Focusing on the No.2 issue, Schlesinger (1971a, 197lb) presented a unique grammar, the Grammar of Realization Rules. In order to investigate the Schlesinger's grammar, especially his "position rules of agent, action, anddirect object", two studies were conducted.The first study dealt with the first phase word combinations by one Japanese boy aged 2;1-2;8. Main results were as follows. The general trend of word order did not always support Schlesinger's grammar. But in some verbs the word order had its individual order. In a second study the utterances of five Japanese children aged between 2;5-3;9 were recorded and analysed. Main results were as follows. The total results of five children supported Schlesinger's grammar. But the results of each child did not always support Schlesinger's grammar.