Technologie: Bildung B 500.235 

TechnolofliY educational d . i I -Centre• 
for Educational Research and Innovation 
<CERI}. Educational technology. The designand implementattion of learning systems. 
This report is based on the work of CERI ..• 
at Leiden, Netherlands, from 9th to 25th 

80

April, 1970. -(Paris:) OECD 1971. 86 S.