prblem

proliferation of research

2 6 theory at the time/

usually one dominant theory. 

accepted as the best theory by most scientis in the field.

for example,

someone called you..

Arozina.

越南孩子

这些孩子怎么跟英语孩子？

双语？

immersion?

60 theories

SLA  -solve intelutual problem

the other one is social problem

unify!

evaluate important.

opposinational claim.

I

i+1

rival theory make competing...

is wise spread.

explicite area.

SLA future direction.

not healthy.