**7. Selection, design, application, and evaluation of the intervention procedures**

The selection, design, implementation, and evaluation of the intervention program are the last steps of the methodology and arise from the analysis performed in the previous steps. The emphasis at this point is to design or select strategies based on functional criteria consistent with the functional nature of the studied behavior, the type of procedure according to its effects, and the roles that the psychologist must perform.

Considering that each behavior of interest is unique and therefore there are no "ad hoc" techniques to solve some or to make changes, a selection or individualized design that may consider the use of already established behavioral techniques or of non-standardized procedures is required [11].

According to the foregoing, Díaz-González et al. [12] propose that the design and selection of the intervention must be based on the identification or performed analysis in the first three steps, as well as in the chosen solution. Subsequently, the type of intervention is selected or designed considering the following functional criteria: (1) nature of the therapeutic interaction, (2) type of procedure in terms of its effects, and (3) counselor's roles.

#### **7.1. Nature of the therapeutic interaction**

This first section considers the studied interaction's characteristics, as well as the specific characteristics of the behavior to which the technique or procedure is addressed. For this, there are five categories that account for the interaction's functional nature [1].

