The main objective of this paper is to investigate the use of Information and Communication Technologies (ICT) and derive the success factors of eParticipation initiatives according to the practitioners' view. For this purpose, a European survey took place using questionnaires. The results suggest that the tools and technologies currently employed are mainly general purpose and not specifically designed for eParticipation. The results further suggest that success factors can be grouped together in seven categories, namely commitment by the government; usability; combining online with offline channels; a thorough communication and promotion plan; security and privacy; organisational issues; and topics' complexity and quality of participation. A comparison with published success factors of eGovernment initiatives suggests there are similarities but also significant differences. We anticipate that the results will be of interest to practitioners as they distil others experience in a usable form. We further anticipate that this work will be of interest to researchers as it will enable validating eParticipation evaluation models.