Susceptibility to Infidelity Instrument – SII
Measures an individual's self-reported susceptibility to committing infidelity, their perception of their partner's susceptibility, and the likelihood of relationship dissolution if infidelity occurs.
Scale Development & Technical Details
Scale Overview
The Susceptibility to Infidelity Instrument – SII was developed by David M. Buss & Todd T. Shackelford (1997). It is designed to measure Susceptibility to infidelity and relationship dissolution likelihood. The scale is intended for use with Adults in romantic relationships.
Scale Structure
This instrument consists of 36 items organized into 4 factors/subscales: Partner Infidelity Likelihood, Self Infidelity Likelihood, Self-Initiated Dissolution, Partner-Initiated Dissolution.
| Factor / Subscale | Items | N |
|---|---|---|
| Partner Infidelity Likelihood | 1,4,7,10,13,16 | 6 |
| Self Infidelity Likelihood | 19,22,25,28,31,34 | 6 |
| Self-Initiated Dissolution | 2,5,8,11,14,17,20,23,26,29,32,35 | 12 |
| Partner-Initiated Dissolution | 3,6,9,12,15,18,21,24,27,30,33,36 | 12 |
Response Format
Respondents rate each item using a custom response format.
Response anchors: 0 = 0%, 10 = 10%, 20 = 20%, 30 = 30%, 40 = 40%, 50 = 50%, 60 = 60%, 70 = 70%, 80 = 80%, 90 = 90%, 100 = 100%.
Scoring
Items are scored by subscale, with each subscale sum representing a distinct dimension.
Total scores range from 0 to 100. Interpretation guidelines:
- Scores represent the mean estimated probability (0-100%) for each subscale.: 0 – 100
Psychometric Properties
Internal Consistency: The scale has demonstrated good to excellent internal consistency with reported Cronbach’s alpha values of Not specified in source text.
Administration
The scale is self-administered and typically takes approximately 10 minutes to complete. It can be administered individually or in group settings. No special training is required for administration.