Objective:

This paper aims to assess the effectiveness of the Psycho-educational Program for Stimulation and Development of Formal Thinking N.A.P in ninth grade students of a public school at Magdalena (Col), designed by Núñez, Anaya and Prieto (2014).

Method:

This is a quantitative research, with a quasi-experimental design before and after sampling, and with a non-equivalent control group. 48 students from 13 to 17 years old, 25 male and 23 female, selected through an intentional non-probabilistic sampling were sampled. 27 students were part of an experimental group and subjected to the program with an average of one hour per week. While 21 control group-students were not intervened. The effectiveness of the program was determined through the TOLT test (Tobín & Capie, 1981).

Results:

Using the Student’s T statistic, a 0,003 value of the margin of error was found, indicating significant variations between the pre-test and post-test of the experimental group, and in the control group there was no significance, indicating that the program had success in stimulating formal thinking.

Conclusion:

The research findings showed the effectiveness of the program for the development of formal thinking, in the post-test of the experimental group 38 % of students were in transition and 3 % in the formal level; in the control group 100 % of students before and after were located at the concrete level. In addition, the skills enhanced with the activities of the program were proportionality and correlation, therefore it can be useful in the academy to stimulate this type of thinking.

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