New hand-held computers that keep an eye on pupils bunking off class are to be introduced in some comprehensive schools.
Six hundred secondary schools in England are to be supplied with the equipment, which will make sure persistent truants can be tracked from lesson to lesson.
If a child has wandered off, the information would immediately be sent back to the school office, which would then contact the pupil's home.
Education Minister Estelle Morris unveiled the system which will cost £11.25 million.
Trials had shown that electronic registration cut truancy by 10%.