Data were collected right after the students done answering the Matter Concept Understanding Test Set at the
Submicroscopic Level through the semi-structured interview which are the guided imagery interview and
document analysis. This interview is an instrument that is carried out in the form of open-ended questions with
the purpose of assessing the students’ understanding on the scientific aspects of the concept of matter at
submicroscopic level. The interview selection as a method to collect the data is very appropriate in obtaining indepth
and detailed information as well as to discover the explicit and implicit in an individual’s mind (Patton,
2002) while document analysis plays a role as the third source of data in the qualitative research (Merriam, 1998).
5. Data Anaysis
All interviews are recorded and transcribed verbatim. After each of guided imagery interview is done, the
recording is heard and the transcription of it is produced to make sure the interview can be written perfectly. One
of the transcription’s copies is handed to the participants for the purpose of review and validation. The
transcription is then analyzed using grounded theory analysis strategy which involves three stages, namely open
coding, axial coding and selected coding. NVivo Program version 10.0 and ATLAS.ti version 7.0 is used as
assistance in understanding the large and unorganized data.