Scale Overview
The Susceptibility to Infidelity Instrument was developed by David M. Buss & Todd K. Shackelford (1997). It is designed to measure Susceptibility to Infidelity. The scale is intended for use with Adults in romantic relationships.
Scale Structure
This instrument consists of 12 items organized into 2 factors/subscales: Partner Susceptibility, Self Susceptibility.
| Factor / Subscale |
Items |
N |
| Partner Susceptibility |
1,2,3,4,5,6 |
6 |
| Self Susceptibility |
7,8,9,10,11,12 |
6 |
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:
- Average estimated probability percentage of infidelity occurring within the next year (0-100%): 0 – 100
Psychometric Properties
Internal Consistency: The scale has demonstrated good to excellent internal consistency with reported Cronbach’s alpha values of Not specified.
Administration
The scale is self-administered and typically takes approximately 5 minutes to complete. It can be administered individually or in group settings. No special training is required for administration.