Prefer object orientation to procedural programming

Object-oriented programs (classes, interfaces) are segmented better and can be refactored and tested more easily than procedural code (functions, programs). Although there are situations where you must provide procedural objects (a function for an RFC, a program for a transaction), these objects should do little more than call a corresponding class that provides the actual feature:

FUNCTION check_business_partner [...].
  DATA(validator) = NEW /clean/biz_partner_validator( ).
  result = validator->validate( business_partners ).
ENDFUNCTION.

Function Groups vs. Classes describes the differences in detail.