Why are powers classified?

The functions' classification (the triad): the legislative (the general rules' making), the judicial (the disputes' deciding), the administrative (the policy's execution) — the pure theory's separation + the modern blend (the administration exercising all three in modified forms). Theneed: the control's tailoring (each function's own discipline: the rule-making's publication; the adjudication's hearing; the administration's hierarchy); the citizen's protection (the functions' identification → the rights' identification); the constitutional analysis (the separation's checking).