A weak negative attitude towards learning science was noticed among the students in Qatar, a matter that was reflected on their achievement in national tests. To test if the use of PBL would improve the students' attitudes towards learning science, a sample of 25 nine graders from Hamza school were motivated to plan their own investigations and to implement their projects on the following two problems: (1) One World, One Environment; and (2) Obesity Survey Study. The main objectives of the study were: (1) To test if the use of PBL would improve the students' attitudes towards learning science among nine graders in Hamza school; (2) To provide high quality learning by allowing students to do some "real" science through developing and testing their own hypothesis; (3) To improve teamwork skills; (4) To boost the students' confidence in their ability to apply knowledge and skills to problem-solving; (5) To enhance the presentation skills of the students; and (6) To encourage the students to use ICT effectively. A questionnaire was developed to measure the students' attitudes. The analysis of the results and reviewing the reflective journal showed that 22 students out of 25 students, who participated in the project, have strong positive attitudes towards learning science, working in groups and participating in project based learning. Only 3 students could not yet determine their educational needs. (Contains 1 table.)