This document summarizes a thesis that examines the use of information and communication technologies (ICT) like the internet and mobile phones in marketing by five companies in Dublin, Ireland. The study aims to evaluate how the selected companies use ICT tools in their marketing, which tools are used most, and the impact of ICT usage. Questionnaires and interviews were conducted to analyze website usage, email marketing, SMS/MMS usage, and the relationship between ICT implementation and marketing performance. The results provide insights into how effectively the companies leverage different ICT channels in their marketing.