Here is a paper that may be helpful to you.  It's published in EDUCATIONAL RESEARCH FOR POLICY AND PRACTICE.

"This article examines the meanings and impact of ‘Assessment for Learning’ initiatives in schools against the back drop of assessment reform in Singapore since 1997. It is argued that Assessment for Learning’ is understood in different ways, and

these different meanings do not always benefit students’ learning."

Article Assessment for learning in Singapore: Unpacking its meanings...

These could be useful:

http://www.unicef.org/ceecis/BenavotCAFE(Final).pdf (one can use it to trace development over time)

and

http://www.fed.cuhk.edu.hk/~hkpisa/output/files/Student%20Learning%20Assessment%20by%20Esther%20HO_UNESCO.pdf

Hope this helps! Best of luck!

Miranda yeoh, Ivo Carneiro, and Milena Dobreva, i am so proudly for your attention. all of artticle are very helpfull to support my research. i hope we can give contribution each other. thank so much