1 Functional Theory. 2  The functional approach to small group communication is concerned with the results or outcomes of group behaviors and structures. 3  Research conducted from this perspective suggests that several conditions must exist for group members to make appropriate decisions and effectively solve problems.xamine a small group communication case study through multiple lenses.. Your two primary objectives are to analyze and evaluate the group's communication and performance. Guidelines. You will analyze and evaluate the case using three perspectives: systems theory and two other theories of your choice.