id	keyword
hassl-4046	learning
hassl-4046	pbl
hassl-4046	model
hassl-4046	skills
hassl-4046	students
hassl-4046	problem
hassl-4046	pbl model
hassl-4046	research
hassl-4046	century
hassl-4046	thinking
hassl-4046	education
hassl-4046	collaboration
hassl-4046	teamwork
hassl-4046	development