CTSO stands for Career and Technical Student Organization.  Lehman High School has DECA and BPA. Here are some quick videos explaining each organization

DECA

High School Student  talking about joining a CTSO organization

BPA

Lehman HIgh School Student Responses to a mock role-play held on campus:

Performance Indicators Activity: 21st Century skills is something students are evaluated for DECA role-plays.  Students provided feedback from working in groups based off 21st Century skills performance indicators.