Internal Control Index – ICI
Measures an individual's locus of control, distinguishing between internal and external cognitive orientations.
Scale Development & Technical Details
Scale Overview
The Internal Control Index – ICI was developed by P. C. Duttweiler (1984). It is designed to measure Locus of Control. The scale is intended for use with Adults and college students.
Scale Structure
This instrument consists of 28 items organized into 2 factors/subscales: Confidence in one’s own ability, Autonomous behavior.
| Factor / Subscale | Items | N |
|---|---|---|
| Confidence in one's own ability | 3,4,5,7,9,10,13,15,16,18,20,21,25,28 | 14 |
| Autonomous behavior | 1,2,6,8,11,12,14,17,19,22,23,24,26,27 | 14 |
Response Format
Respondents rate each item using a custom response format.
Response anchors: 1 = Usually, 2 = Frequently, 3 = Sometimes, 4 = Occasionally, 5 = Rarely.
The scale includes 14 reverse-scored items to reduce acquiescence bias.
Scoring
Items are summed to produce a total score.
Total scores range from 28 to 140. Interpretation guidelines:
- Low Internal Control (External Locus of Control): 28 – 65
- Moderate Internal Control: 66 – 102
- High Internal Control: 103 – 140
Psychometric Properties
Internal Consistency: The scale has demonstrated good to excellent internal consistency with reported Cronbach’s alpha values of Alpha coefficients of 0.84 to 0.85.
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.