  This is a very pedagogical review of supersymmetry phenomenology, given at
ICTP Summer School in 1999, aimed mostly at students who had never studied
supersymmetry before. It starts with an analogy that the reason why
supersymmetry is needed is similar to the reason why the positron exists. It
introduces the construction of supersymmetric Lagrangians in a practical way.
The low-energy constraints, renormalization-group analyses, collider
phenomenology, and frameworks of mediating supersymmetry breaking are briefly
discussed.
