Scale Overview
The Source Credibility Measures was developed by James C. McCroskey & Jason J. Teven (1999). It is designed to measure Source Credibility. The scale is intended for use with Employees / Adults.
Scale Structure
This instrument consists of 18 items organized into 3 factors/subscales: Competence, Caring/Goodwill, Trustworthiness.
| Factor / Subscale |
Items |
N |
| Competence |
1,2,7,11,13,16 |
6 |
| Caring/Goodwill |
3,5,8,9,15,18 |
6 |
| Trustworthiness |
4,6,10,12,14,17 |
6 |
Response Format
Respondents rate each item using a custom response format.
Response anchors: 1 = Very strong feeling (left anchor), 2 = Strong feeling (left anchor), 3 = Fairly weak feeling (left anchor), 4 = Undecided, 5 = Fairly weak feeling (right anchor), 6 = Strong feeling (right/anchor), 7 = Very strong feeling (right anchor).
The scale includes 9 reverse-scored items to reduce acquiescence bias.
Scoring
Items are scored by subscale, with each subscale sum representing a distinct dimension.
Total scores range from 6 to 42. Interpretation guidelines:
- Low Credibility: 6 – 18
- Moderate Credibility: 19 – 30
- High Credibility: 31 – 42
Psychometric Properties
Internal Consistency: The scale has demonstrated good to excellent internal consistency with reported Cronbach’s alpha values of Typically > .80 for all subscales.
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.