1 Girls start having periods at different times depending on how quickly they are developing.  If a girl has not had her first period by the time she is 16, this is still probably normal, but it would be worth checking with a doctor.
IETMS stands for Interactive Electronic Technical Manual System. Israeli English Teachers' Network. Institution of Engineering and Technology Northern Ireland. Institute of Engineering Technology of Ontario (Canada) Interagency Environmental Technology Office (Washington, DC) Industrial Effluent Treatment Plant.
It proposes to replace the national systems with a unique European system (ERTMS). The ERTMS is composed of two big parts (Winter, 2009). First, the European Train Control System (ETCS), composed of two âmodulesâ (track and train), allows data transmission in the cab from the rail signalling system and their processing by the board computer.