The second Interreg project concerning Marinas and Yachting in the Irish Sea and Lower North Sea, known as MAYA 2, chose to create joint project management teams (JMT’s) to facilitate the transfer of knowledge between partners. One of these JMT’s had as its theme ‘Socio-economic impacts of the MAYA 2 investments’. The subsequent growth in maritime activities as a result of marine investment leads to economic benefit both locally and regionally. It is important to monitor these effects. This report starts with an overview of existing research regarding the socio-economic value of the marine leisure industry in each of the larger MAYA 2 investment areas. In the chapter ‘Investments and their Surrounding Areas’ we explain a little about each of the partners and their investments, including some information about the areas surrounding the investments.It is important to try and use indicators that wherever possible measure the effects of the actual investments and not changes that could be due to other influences, although this is often not easy as many factorsinfluence the use of marine facilities, e.g. the weather, time of year, events happening in the area. Visitor satisfaction surveys can be a useful tool and therefore the JMT constructed a generic questionnaire usingquestions from survey forms already in use. This was then adapted by each partner to suit their investments and used where applicable to collect data.As the types of investments differ so much from one project partner to another, it was decided, after much discussion, that a ‘joint model’ in the classical sense of the term is not possible in this case, but that a ‘jointmethodology’ should be used instead. To do this each partner has selected relevant indicators from a common list (see appendix 1) and applied them to their particular investments.In the chapter ‘Findings’ the results are described, originating from the information gathered. This information is obviously not directly comparable between partners or investments; therefore each investment will be treated as a separate case study for the purposes of this report.Due to the installation of some investments later in the project, it was not possible to collect data for all investments in time for reporting in this document. In these cases baseline data has been collected andpredictions have been made where possible. It is planned that data will be collected in the future where possible and the socio-economic effects monitored.In the ‘Conclusions’ section we sum up the findings of the research. The increase in quantity has been gathered from collecting numbers of, mostly, visitors and boats. The quality of the facilities is mostly measuredby visitor surveys. Not every partner has yet accumulated figures that show an increase in the quantity or quality of the marina and/or berthingdue to the timescales of the MAYA 2 project, but it is planned that thiscould be done in the future where possible.