http://infor.seaninstitute.org/index.php/pendidikan JURNAL SCIENTIA, Volume 9 No 2 Februari 2021 ISSN 2302-0059 Jurnal Scientia is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License (CC BY-NC 4.0) 46 THE EFFECTIVENESS OF PROJECT-BASED LEARNING WITH THE BLENDED LEARNING SYSTEM TO IMPROVE 21ST CENTURY SKILLS DURING THE COVID-19 PANDEMIC Eris Nurhayati 1 , Dedi Riyan Rizaldi 2 *, Ziadatul Fatimah 3 1,2,3 Master of Science Education Study Program, University of Mataram, Mataram, Indonesia *dedi0313@gmail.com Article Info Received : 15/02/2021 Revised : 18/02/2021 Accepted : 22/02/2021 Abstract This research is a classroom action research to provide an overview regarding the use of a project-based learning model with a blended learning system during the new normal period of COVID-19. The design model used is the Kurt Lewin model which consists of four stages, namely 1). Planning, 2). Action, 3). Observations, and 4). Reflection. The study population was all students of class XII SMAN 3 Mataram with a sample of 102 students who were divided into three classes. All research samples are taught with a project-based learning model with a blended learning system. Based on the research that has been done, it is known that the project-based learning model with the blended learning system can be applied in the learning process to improve 21st-century skills during the COVID-19 pandemic. Keywords: Project-Based Learning, Blended Learning, 21st Century Skills, The COVID-19 Pandemic 1. INTRODUCTION The Corona Virus Disease 2019 (COVID-19) pandemic has now become one of the global challenges that have led to the emergence of multidimensional problems in the political, ideological, religious, cultural, and academic fields. Medical personnel and public health workers are at the forefront, working hard to control and reduce the spread of the disease [1,2]. Various policy formulas have been implemented to suppress the spike in the spread of the virus, including Large-Scale Social Restrictions and recommendations to carry out four habits, namely washing hands, wearing masks, maintaining physical distancing, and avoiding crowds. Various agencies, especially government agencies, have implemented work from home programs. The Ministry of Education has also implemented the learning from the home program since March 16, 2020 [3]. However, all efforts have not been able to make the curve of the spread of COVID- 19 in Indonesia smooth. So that the government began to implement new habit adaptations, better known as new normal, in early June 2020. Education is a primary need that cannot be abandoned no matter what conditions occur. Following the mandate of the Constitution that the purpose of education is to educate public life. The essence of education is learning is not just schooling [4]. Schools as educational institutions that have various platforms and all of them have been held in Indonesia. It's just that the community views the school as a building containing teachers and students in it. Learning is a process of interaction between students and educators and learning resources in a learning environment [5]. A positive spirit must be cultivated in all components involved in the world of education. Therefore education must continue, regardless of the conditions and problems faced by our country. Then the question arises, how to organize education in the new normal era? Meanwhile, the return to school policy is widely opposed because it is considered to have created new clusters with