The objectives of the work are (i) to analyze customer engagement (CE) within the world of food delivery applications, (ii) to understand its effects and (iii) to find metrics to analyze CE. For this, an in-depth study of the literature will be carried out to analyze the first dimensions correlated with CE and related variables. Then, through focus groups, the previously chosen variables will be better defined. Following this, using some statistical techniques including factor analysis, a scale will be identified to describe CE in online food delivery applications. The work will be divided first into a qualitative part that will explore the issues mentioned above and a second, a quantitative part that will serve to reach a definitive scale.