METHODS
The research design applied to this research is a case study, as a case study is more appropriate if the main question of the research related to how and why, if the research only has little possibility to control events that will be investigated and research focuses on contemporary phenomenon. Case study applied to this research is categorized into explanatory type, this is used to test available, explain, or expand the theories. Therefore, the case study applied to this research pay attention to the theory, in which a case study that facilitates derivative theory (Willig, 2008; Yin, 2015).
Participants that involved in this research are those who have experienced possession disorder twice. This possession disorder is a categorized as a disorder that is meant ICD 10 and DSM 5 (American Psychiatric Association, 2013). All participants have obtained informed consent and expressed their willingness to become participants. This study also received approval from the Research Ethics Committee of the Faculty of Psychology, Gadjah Mada University No. 4204/SD/PL.03.01/XI/ 2017
Possession disorder assessment that has been experienced by the participants conducted by a researcher who practices as clinical psychologist and has received consideration either from the Promoter or Co- promoter to decide whether the participants are appropriate or not.
The researcher chooses Java and outside Java as the research location. The consideration choosing those different locations is to obtain a wide picture about different culture optimally so it can attain the generality of research result.
Data collection method applying semi structured interview and completing sentence test. Semi structured interview has an advantage that facilitates rapport / empathy, give bigger chance of flexibility, therefore it can be reached and it is possible to interview entering new location, it tends to produce more datum (Willig, 2008).
A test used in this research is sentence completion that works based on projective technique, variation from free association method previously developed by Jung (sacks and Levy, 1950). Consistently survey finds completion sentence test is general test used as a personality assessment instrument, especially for favorite variable (Holaday, Smith, & Sherry, 2000; Sherry, Dahlen, & Holaday, 2004).Sentence completion tests used is Sack Sentence completion test (SSCT) (Bastaman, tt; Sacks & Levy, 1950).