Handbook of Management Scales/Ability
Ability (alpha = 0.96/0.96) 
Three facets of trustworthiness were measured based on scales designed by Mayer/Davis (1999) to assess the ability, benevolence, and integrity of a supervisor. The Likert-type scale ranged from 1 (strongly disagree) to 5 (strongly agree).
Ability reflects concepts such as competence, skills, efficiency, and dedication.
- My supervisor is very capable of performing his/her job.
- My supervisor is known to be successful at the things s/he tries to do.
- My supervisor has a lot of knowledge about the work to be done.
- I feel very confident about my supervisor’s skills.
- My supervisor has specific capabilities that can increase our performance.
- My supervisor is well qualified.
- Colquitt/Rodell (2011): Justice, trust, and trustworthiness: A longitudinal analysis integrating three theoretical perspectives. Academy of Management Journal, Vol. 54, No. 6, pp. 1183–1206
The mean value was above four. Given that a 5-point scale was used, future researchers could slightly adapt the items in order to shift the mean value to the center (e.g., “very successful” rather than “successful”).