Quasi-experimental research was conducted to identify the effectiveness of GeoGebra in achieving students’ conceptual and procedural knowledge. The research was performed to identify the effects of a  mediator in students’ conceptual knowledge in relation to procedural knowledge with student achievement. A total of 284 students were involved in this study. The students in the experimental group learned using GeoGebra, whereas the students in the control group used the conventional method. The collected data were analyzed using SPSS 22.0, AMoS 18, and Anates V4. Findings of the study demonstrate that GeoGebra is used as a mediator of students’ procedural knowledge in relation to conceptual knowledge for academic achievement. This study also shows that conceptual knowledge affected the students’ mathematics procedures. The result of the study supports the related theory of the role and contribution of conceptual and procedural knowledge to student achievement. This study provides suggestions as intervention to increase students’ conceptual and procedural knowledge.

Disputes are inherent in social relations, so the role of the legislator is to introduce rules under which they can be resolved. The methods that make it possible to resolve them include ADR methods. Mediation as an alternative form of dispute resolution has been known since antiquity, nowadays its precursor is the United States of America, where at the turn of the 1970s and 1980s alternative methods of conflict resolution were developed. Mediation, next to bargaining and social arbitration, is one of the peaceful methods of solving collective labour disputes. It should be stressed that as a peaceful method of resolving collective disputes, it can be treated as one of the instruments of social dialogue. Dialogue is an inmamental feature of dispute resolution regardless of its typology, and in the case of collective disputes it can be a guarantor of the preservation of social peace. Hence, it is very important to create a legal framework and introduce instruments to increase its effectiveness.