U..V..W..X..Y..Z KEY-WORDS

ubiquitous learning 1

UML 1

user graphic interface 1

validity 1

value chain 1

value co-creation process 1

Verhulst Equation 1

vertical and horizontal integration 1

virtual learning environments 1

visualization 1

vocational conversation 1

vocational education 1

web sites 1

wireless sensors 1 , 2

Zigbee 1 , 2

Zipf law 1 , 2 , 3