The growing number of students and more rigorous academic requirements made way for another expansion program which began in 1998.

The high school focuses on developing a student's intelligence, social life, and overall wellness through rigorous curricular requirements.

School uniforms vary from a standard issue T-shirt to rigorous requirements for many items of formal wear at private schools.

At each rank, the student must also pass a rigorous physical requirement before performing the technical requirements.

The study never had to satisfy the rigorous requirements of peer review, reported as it was in a broadcasting trade magazine.

If allowed, many institutions have rigorous requirements for therapy dogs.

Due to the rigorous requirements, students are to take no more than two AP classes simultaneously.

The new members would need to meet more rigorous requirements to participate in the euro currency, now shared by 12 of the 15 existing states.

Are they too ambitious, though, and can the Member States, especially the new ones, manage to meet the rigorous requirements?

In these car-producing countries particularly rigorous requirements have already been introduced for new cars.