The execution of the concrete mix design experiment in the Faculty of Civil Engineering Laboratory, Universiti Teknologi Malaysia, was changed from an expository type of instruction style to an open-ended style, in order to produce young engineers who are not only well-versed in theories, but are also practical and understand practical situations. The implementation of the open-ended laboratory (OEL) is in line with both the Engineering Accreditation Council (EAC) and Accreditation Board for Engineering and Technology (ABET) engineering accreditation criteria. This book describes the open-ended experiment concept and implementation of a concrete mix design experiment at the Faculty of Civil Engineering, Universiti Teknologi Malaysia. It aims to enable students to develop the ability to design and conduct experiments, to analyse and interpret data, and to work in a group. The OEL assessments which are based on laboratory reports, and additional attributes including the students’ teamwork skills, problem solving skills, and practical skills are discussed.