Investment Model Scale – Job (IMS-Job)
Measures job commitment and its predictors (satisfaction, quality of alternatives, and investment size) based on Rusbult's Investment Model.
Scale Development & Technical Details
Scale Overview
The Investment Model Scale – Job (IMS-Job) was developed by Caryl E. Rusbult & David Farrell (1983). It is designed to measure Job Commitment, Job Satisfaction, Quality of Alternatives, Investment Size. The scale is intended for use with Working adults.
Scale Structure
This instrument consists of 22 items organized into 6 factors/subscales: Rewards, Costs, Quality of Alternatives, Investment Size, Job Satisfaction, Commitment Level.
| Factor / Subscale | Items | N |
|---|---|---|
| Rewards | 1,2,3 | 3 |
| Costs | 4,5,6 | 3 |
| Quality of Alternatives | 7,8,9 | 3 |
| Investment Size | 10,11,12 | 3 |
| Job Satisfaction | 13,14,15,16,17,18 | 6 |
| Commitment Level | 19,20,21,22 | 4 |
Response Format
Respondents rate each item using a custom response format.
Response anchors: 1 = 1 (Low / Negative Anchor), 2 = 2, 3 = 3, 4 = 4, 5 = 5, 6 = 6, 7 = 7, 8 = 8, 9 = 9 (High / Positive Anchor).
Scoring
Items are scored by subscale, with each subscale sum representing a distinct dimension.
Total scores range from 1 to 9. Interpretation guidelines:
- Low: 1 – 3
- Moderate: 4 – 6
- High: 7 – 9
Psychometric Properties
Internal Consistency: The scale has demonstrated good to excellent internal consistency with reported Cronbach’s alpha values of Job satisfaction (a = .90), Investments (a = .87), Alternatives (a = .82), Commitment (a = .88).
Administration
The scale is self-administered and typically takes approximately 8 minutes to complete. It can be administered individually or in group settings. No special training is required for administration.