Six items assess how capable, efficient, organised, and reliable a service employee is in executing core job tasks and meeting customer needs.
Price, L. L., Arnould, E. J., & Deibler, S. L. (1995). Consumers' emotional responses to service encounters: The influence of the service provider. International Journal of Service Industry Management, 6(3), 34–63.
Free access to 2023+ psychometric scales at PsychScales