PBL is NOT New
CARL ROGERS
1902 - 1987
JOHN DEWEY
1859-1952
BENJAMIN BLOOM
1913-1999
SOCRATES
470-399 B.C.
JEROME
 BRUNER
1915-CURRENT
LEV
VYGOTSKY
1896-1934
JEAN PIAGET
1896-1980
SEYMOUR PAPART