This document is a thesis submitted by Anna Drüing and Katharina Fahrenholz to Saxion University in partial fulfillment of a Bachelor of Business Administration degree. The thesis examines how the principles of guerrilla marketing developed in the 1980s are used today and whether they have a future in business. It defines guerrilla marketing and analyzes current instruments used, including out-of-home advertising, ambient marketing, viral marketing, and low budget tactics. A case study of the guerrilla campaign for Bionade drink is presented. Customer and expert perceptions of guerrilla marketing are assessed through a survey and interviews to determine if it remains an effective approach.