The goal of the first PBL project was not to implement a system, but this project made us understand what critical thinking is. Thanks to this project, we have learned to think more widely and analyze the problem from different angles. Our first project is called "FSS: Fast Shopping System". The problem we tried to figure out how to solve was the queue at the markets. Our idea was based on tags that should be put on each product, as well as scanners, which should stand along with the terminals at the cash registers. This system has practically no drawbacks, but there are many advantages. It will attract customers and facilitate their purchase process.