Description

The Self-Disclosure Index (SDI) is a psychological assessment instrument designed to evaluate the extent, depth, and nature of personal information that individuals choose to reveal to others. Self-disclosure refers to the voluntary sharing of personal thoughts, feelings, experiences, beliefs, and private information within interpersonal relationships.

The SDI examines patterns of openness and communication, focusing on how individuals express themselves and establish interpersonal connections through the exchange of personal information.

Objective

The main objective of the SDI is to measure an individual’s tendency toward self-disclosure and their willingness to share personal information with others.

The scale aims to assess different dimensions of self-disclosure, including emotional, personal, and social disclosure, and to examine how self-disclosure influences interpersonal relationships, intimacy, trust, and perceived social support.

The instrument is useful in research on interpersonal communication, relationship development, social functioning, and psychological well-being.

Structure and Content

The SDI includes statements or questions related to the frequency, depth, and type of personal information individuals disclose in their interactions with others.

The assessed dimensions may include:

Emotional Self-Disclosure: The expression of personal feelings, emotions, fears, and inner experiences.

Personal Self-Disclosure: The sharing of private information, personal experiences, and individual beliefs.

Social Self-Disclosure: The openness of communication within social relationships and interactions.

The scale evaluates both the quantity and quality of information shared with others.

Scoring Method

Participants respond to items using a Likert-type or similar rating scale, indicating the degree to which each statement reflects their typical behaviour.

Scores are calculated by summing or averaging responses across items. Higher scores indicate greater willingness and tendency toward self-disclosure, whereas lower scores suggest greater privacy or reluctance to reveal personal information.

Data Analysis and Use

The data collected through the SDI can be analysed using descriptive statistics, reliability analysis, correlation methods, and comparative analyses between groups.

The scale is used to investigate the relationship between self-disclosure and factors such as interpersonal satisfaction, relationship quality, emotional intimacy, social support, and psychological adjustment.

It can be applied in research involving friendships, romantic relationships, counselling processes, and social communication patterns.

Validity and Reliability

Research on self-disclosure has demonstrated that the willingness to reveal personal information is an important factor in the development and maintenance of interpersonal relationships. The SDI is based on theoretical models suggesting that appropriate self-disclosure contributes to intimacy, trust, and social connection.

References

Jourard, S. M. (1971). Self-Disclosure: An Experimental Analysis of the Transparent Self. New York: John Wiley & Sons.

Pennebaker, J. W., & Chung, C. K. (2007). The social, linguistic, and psychological dimensions of expressive writing. In J. W. Pennebaker (Ed.), The Social Psychology of Emotion (pp. 50–65). Routledge.

Miller, R. S., & Stiver, J. L. (1996). Self-disclosure and relationships. In P. N. Sternberg & L. A. C. Marlowe (Eds.), The Psychology of Self-Disclosure (pp. 91–105). Cambridge University Press.

Collins, N. L., & Miller, L. C. (1994). Self-disclosure and liking: A meta-analytic review. Psychological Bulletin, 116(3), 457–475.

Altman, I., & Taylor, D. A. (1973). Social Penetration: The Development of Interpersonal Relationships. New York: Holt, Rinehart & Winston.