Drug use among adolescents is increasing in early ages. The study on drug use in secondary education (ESTUDES) (OEDT, 2020) found that 77.9% of the adolescents between 14 and 18 years old had consumed alcohol at least once in their life, 75.9% in the previous year. The girls showed higher taxes than boys in all age groups. The use of illegal drugs, such as cannabis has also increased, 27,5% of the adolescents confirmed they had smoked cannabis during last year, 19.3% in the previous month. Behavioral addictions such as gambling, the use of video games and compulsive use of the internet have also increased in recent years among both boys and girls (OEDA, 2021).

Likewise, it is noteworthy that Sexually Transmitted Diseases (STDs) have experienced a notable increase. Since 2017 there has been an increase in STDs, registering more than one million new cases daily (WHO, 2018; HIV Surveillance and Risk Behavior Unit, 2019). Comprehensive affective-sexual education plays a fundamental role in health and wellbeing (Venegas, 2018) and is considered a priority in the agenda of the International Sustainable Development Goals and the United Nations.

Research shows that affective-sexual education programmes based on life skills (affective, communicative, and/or social relationship variables) show better results than standard sex education programmes (Lee & Lee, 2019) and that parents have a very important impact on the affective-sexual education minors receive. In fact, parents’ attitudes and involvement in affective-sexual education influence adolescents’ ability to respond when faced with problems arising from their interaction with mass media and the Internet (Davis et al., 2019).

Along these lines, family-based interventions have proved to be effective in preventing drug abuse (Chang et al., 2017; Ballester et al., 2018), sexual risk behaviours (Prado et al., 2019; Spoth et al., 2008; Jensen et al., 2014) and other risky behaviours, demonstrating that parents generate a significant impact with their teenage children on decision-making.

The Programa de Competencias Familiar Afect 12-16 (PCF-AFECT) is a socioeducative family prevention programme aimed at families with adolescents at risk. It is a renewed programme of the PCF 12-16, which in its origins, it was based on the Family Competences Programme (Kumpfer, 1989). However, it has undergone a cultural adaptation and content adaptations. The PCF-AFECT 12-16 has included novelties in the following areas:

• Inclusion of motivational interviewing sessions prior the implementation of the programme to enhance the adherence of families in the programme.
• Enhancement of drug prevention for adolescents and their parents.
• Inclusion of behavioural addictions topic.
• An emphasis on sexual and affective education and communication within families has also been included and stressed in the programme.

The aim of the programme is to improve family dynamics, family relation and communication, as well as assertiveness in order to prevent addictions, risky sexual behaviours as well as other disruptive behaviours in adolescents.

In this paper we present the evaluation protocol of the effectiveness of PCF-Afect 12-16. The evaluation of the effects of the programme follows a pre-test post-test quasi-experimental design with both control and experimental groups. Different assessment instruments are used in order to analyse the effects of the programme on the state of change of each member of the family, family dynamics, family communication on affective-sexual education, adolescents’ behaviours and emotions, adolescents self-regulation and assertiveness, their attitudes towards drugs, and the use and abuse of technologies, internet and social media by adolescents.

Pre-test post-test quasi-experimental design with control and experimental groups is used to analyse the effects of the programme. The programme is implemented in Spain (Balearic Islands, Andalusia and Castilla y León). Programme targets are 100 families with children aged between 12 and 16 years old, with a gender balance. The evaluation protocol includes the evaluation of the results and effects of the programme (pre-test post-test measurements of both the experimental and control group) as well as the evaluation of fidelity throughout the implementation. Different measurement tools are used in order to analyse the effects of the programme on the state of change of each member of the family, family dynamics, family communication on sex, adolescents behaviours and emotions, self-regulation and assertiveness, their attitudes towards drugs, and the use and abuse of technologies, internet and social. Concretely, the instruments used are: - URICA. University of Rhode Island Change Assessment Scale. Informed by parents and for adolescents. - KK kumpfer questionnaire for parents and KK kumpfer questionnaire for adolescents (Kumpfer, 1989) in order to analyse family dynamics, comprising parenting skills (affective quality, attachment, monitoring, management, time together, involvement, discipline) and family environment (family conflict, cohesion, organization and mobility). - Questionnaire to assess family communication on sex, informed by parents and adolescents. - BASC-2 test, informed by parents, adolescents and teachers to analyse adolescents’ behaviours and emotions. - DERS. Spanish adaptation of the Difficulties in Emotion Regulation scale (Hervás & Jodar, 2008), informed by adolescents. - R.A.S. Rathus test of assertivity, informed by adolescents. - CAD. Questionnaire about attitudes towards drugs (Macià, 1986), informed by adoelscents. - EUPI-a questionnaire (Rial et al., 2015). Questionnaire on the problematic use of the internet, informed by adolescents, to analyse the effect of the programme on the use and abuse of the internet and social network. - Questionnaire on the use of technologies informed by parents and adolescents. To analyse the fidelity of implementation, the following instruments are used: - Self-report on the use of Motivational interviewing techniques by the trainer. - Self-report or external observer on the fidelity of implementation. In order to analyse the extent to which the trainer has followed the manual throughout implementation. T-test and ANOVAs will be used to analyse the effects of the programme, as well as to find out if there are gender, age and family profile differences in the gain obtained, if any.

In this paper we present the evaluation protocol of the PCF-AFECT 12-16, the main objectives and the measurement tools that will be used during the implementation. As it has been stated, the PCF-Afect 12-16 is a renewed version of the PCF 12-16, which was initially based on the Strengthening families programme. Several changes have been introduced in PCF-Afect 12-16: (1) two motivational interviewing sessions prior implementation, aimed at identifying and overcoming possible participation barriers, by identifying resistance in advance so as to reduce the likelihood of obstacles arising during the sessions and tackling participants’ ambivalences in order to optimise family adherence throughout the sessions. (2) Maintenance of motivational interviewing style throughout the programme (3) inclusion of behavioural addictions topic and examples in parents and adolescents sessions to strengthen prevention (4) improvement of drug prevention contents and communication, and (4) acquisition of healthy habits and affective-sexual prevention, based on family communication. During January 2022 the PCF-AFECT 12-16 is being implemented in the Balearic Islands and throughout the year it will be also be implemented in Andalusia and Castilla-León. The target sample is 100 families with adolescents at risk. The evaluation protocol and the preliminary results of the implementations of the programme will be presented in the conference. These results will focus on the effect of the programme on family dynamics, family communication on sex, adolescents’ behaviours and emotions, adolescents’ assertiveness and self-regulation skills as well as their attitudes towards drugs, the use or abuse of technologies, internet and social media. The results will focus in the general sample. Still, a detailed analysis will be run on gender differences, age differences, and also differences according to family profiles.

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