The apps I used today - I was writing mostly on Bamboo Paper.
This framework was introduced in 1992 and is still the one used today.
The research started in 1980 with the setting up of Curriculum Development Institute of Singapore under the leadership of Dr Kho Teck Hong.
It started with students performing at a low level.
Why problem solving?
Based on recommendations of Agenda for Action and Cockcroft Report and also predictions of what the economic needs.