Wedding invitation
Smallest unit of society
Family
person whom one knows and with whom one has a bond of mutual affection, typically exclusive of sexual or family relations
Friend
flies you to places
airline company
interviews to know your goals, skills etc.
Company/HR
follows the systematic method
researcher
consists of grandparents, aunts, uncles, cousins that all live nearby or in a single household
part of your organization
receives and reply to complaints comments and suggestions of customers
customer service
possible workmate
colleague
guides and gives comments on your study
thesis adviser