produce vocabularies especially in English. Her age is known as the critical age or critical period. Critical age or critical period means the period of child that heshe
becomes more critical to the surrounding, especially critical to a language. Therefore, her parents also gave many efforts to her in acquiring her first language
acquisition. The efforts of the parents could be seen by the results of the interview.
Meanwhile, secondary data of this study was obtained from the books, thesis and articles in Journal International related to the discussion of this study.
The secondary data must be relating to the theory used in this study. The purpose of obtaining the secondary data from the books, thesis, and journal are to support
the primary data taken from Tonya as the subject of this study and to see the strength, the weakness and the relevance between the previous study and this
study.
1.5.2 Method and Technique of Collecting Data
The data sources in this study have been taken f rom “Tonya” as the
primary data. The primary data relating to this study was collected by observing Tonya directly and
giving an interview to Tonya’s parents. The method used in collecting the data is in accordance with the need of the study.
In this study, the data of Tonya as the primary data was obtained by using the participatory observation, because Tonya as the subject was observed directly
once a week on the weekend for three months. Tonya was observed for three until five hours directly.
Meanwhile, the data from Tonya’s parents was obtained by interviewing
Tonya’s parents for thirty minutes. There are nine questions given to
be answered. Therefore, based on the information given by her parents, the data relating to the discussion of this study are obtained. Meanwhile, the books,
articles, and thesis relating to this study as the secondary data was obtained by library research method.
The technique used in obtaining the data from Tonya and her parents is by note taking and recording. The information obtained from the results of
interviewing Tonya’s parents was noted on a piece of paper randomly. Meanwhile, the information obtained from observing Tonya directly was
recorded. The data obtained by interviewing her parents and by observing Tonya directly would be supported by the secondary data. The secondary data was
collected from the books, articles and thesis relating to Tonya’s case to support
the primary data taken from Tonya as the main subject of this study. Therefore, the technique used in collecting the data is firstly, make and
arrange a list of the questions. Secondly, make an appointment with Tonya’s parents and do an interview with Tonya’s parents based on the question. Thirdly,
make small note about the information given by Tonya’s parents. Fourthly,
observe Tonya directly in using the language. Finally, the primary data obtained from the result of interviewing Tonya’s parents, observing Tonya directly and the
secondary data obtained from library research have been collected. All of the collected data was analyzed by some theories related to the language
development.
1.5.3 Method and Technique of Analyzing Data
