Several scales are used to measure service quality after the provision of services. Customer evaluation is based on contrasting expectations with the perception of the service. Service companies require instruments to assess their readiness with respect to the quality of the service to be rendered. This paper proposes a construct based on variables defined in international quality models and service measurements. The content validity of the construct was calculated using the content validity ratio and index methods by forming the group of items that the instrument should contain, followed by a reliability test of the construct's measurement scale using Cronbach's alpha. The sample comprised of 40 service companies. Results were analysed using descriptive statistics and exploratory factor analysis to demonstrate the instrument's validity and reliability. The adoption of data reduction techniques made it possible to find homogeneous groups within the variables studied and three typologies or business clusters were identified.