## 3 Conversation Collection Protocol  
The spontaneous analysis must be conducted under the same conditions and environment to ensure the reliability of the analysis. The rules created for this purpose are conversational protocols. In this study, the conversation collection protocol uses the conversation collection method established by the Division of Speech Pathology and Audiology of Hallym University [9]. The conversation is one-on-one and takes about 10 to 15 min. As shown in Figure 1, the conversation collection protocol proceeds in the order of introduction, procedure explanation, conversation initiation, topic maintenance after conversation initiation, topic change, and dialogue ending, and the description of each step is as follows:* Conversation Introduction Stage: It is a process of greeting and introducing each other, and it is a process of talking naturally with the child. The purpose of the experiment is not revealed to the child in order to maintain the objectivity of the test.
* Procedure Explanation Stage: This is the stage where you explain how the conversation will proceed. The conversation procedure is as follows. First, the expert shows the prepared photographs of 3-5 sheets, and the child expresses what comes to mind after looking at the pictures. The topic of the picture includes scenes of conversations with friends, scenes of school grounds, scenes of gathering with family, and more. All pictures are in color and are the same size, A4. Each picture indicates a topic for the child to talk about. At this time, experts should inform the child that they should be talking about their experiences rather than describing the situations described in the picture.
* Conversation Initiation Stage: It is very important because it is the stage in which conversation data necessary for spontaneous speech analysis are collected in earnest. When a child looks at a picture and tells an experience about it, the expert must either preserve the conversation topic or transition to a different picture topic, depending on the utterance. For example, if the child says \"I went on a trip with my family\" the expert maintains the topic to elicit various utterances from the child. Therefore, the expert must respond as if imitating a child's utterance so as not to change the topic the child is talking about. The expert must have a response that encourages the child to answer, such as \"Did you go on a trip?\" or \"And then?\". If the child directly states that there is nothing to talk about the topic, or if they talk about a topic for a long time, the expert uses their judgement to change the topic. In case of changing the topic, the expert shows the rest of the pictures that the child has not selected and repeats the procedure of maintaining the topic and changing the topic while continuing the conversation. When enough utterances have been collected or the talk regarding the prepared picture has been completed, the conversation ends.  
Among the spontaneous speech collection procedures, the introduction and procedure explanation are the parts where the expert explains the set contents. However, since the child and the expert interact and proceed with the conversation after the conversation starts, the expert must respond according to the situation. The utterance collecting model  
Figure 1: Conversation collection protocol process.  
suggested in this work intends to be able to respond with relevant utterances based on the utterances of children at the stage of conversation beginning.