Marin-Garcia, Juan A., Lucia Ramirez Bayarri, and Lorena Atares-Huerta. 2015. “Protocol: Comparing Advantages and Disadvantages of Rating Scales, Behavior Observation Scales and Paired Comparison Scales for Behavior Assessment of Competencies in Workers. A Systematic Literature Review”. WPOM-Working Papers on Operations Management 6 (2):49-63. https://doi.org/10.4995/wpom.v6i2.4032.