Checklist Individual Strength – CIS-20
A 20-item self-report questionnaire designed to assess subjective fatigue and related behavioral aspects over the past two weeks.
Scale Development & Technical Details
Scale Overview
The Checklist Individual Strength – CIS-20 was developed by Vercoulen JHMM, Swanink CMA, Fennis JFM, Galama JMD, van der Meer JWM, Bleijenberg G (1994). It is designed to measure Subjective fatigue and related behavioral aspects. The scale is intended for use with Adults, elderly, and clinical populations.
Scale Structure
This instrument consists of 20 items organized into 4 factors/subscales: Fatigue Severity, Concentration, Motivation, Physical Activity.
| Factor / Subscale | Items | N |
|---|---|---|
| Fatigue Severity | 1,3,4,6,11,14,16,18 | 8 |
| Concentration | 9,10,15,19 | 4 |
| Motivation | 2,8,12,20 | 4 |
| Physical Activity | 5,7,13,17 | 4 |
Response Format
Respondents rate each item using a custom response format.
Response anchors: 1 = Yes, that is true, 2 = 2, 3 = 3, 4 = 4, 5 = 5, 6 = 6, 7 = No, that is not true.
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 20 to 140. Interpretation guidelines:
- Normal/Low Fatigue: 20 – 75
- Severe Fatigue: 76 – 140
Psychometric Properties
Internal Consistency: The scale has demonstrated good to excellent internal consistency with reported Cronbach’s alpha values of Cronbach's alpha typically ranges from 0.83 to 0.92 for the 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.