The present document gives an introduction to and an analysis of the most important issues and areas of relevance to context dependent multilingual communications for interactive applications. It provides a clear description of the most common difficulties and problems faced by application designers and localisers today@ and how they solve or work around these. The scope of the present document is summarised through the following statements about the study: 1) It defines localisation and explains what is involved in the localisation process of interactive application@ including the management of interactive and non-interactive applications translations. 2) It describes in detail problems and issues related to the localisation of interactive applications@ to help understand the limitations@ needs and existing solutions or work-around used in the field. 3) It identifies the different industrial and technical domains that are directly concerned by the issue. It looks at several innovation activities related to the domain and provides a state-of-art presentation of languages technologies and research in the domain of multilingual applications@ translation management and localisation. 4) It collects information from the different industry sectors identified@ examining their needs@ their localisation process@ their management of translations@ and potentially@ specific tools or processes they are using for solving or working around the problem. 5) It provides a generic analysis of the situation@ plus a specific analysis related to each identified industry sector. The present document addresses the localisation process@ which covers a large spectrum of issues and activities. However@ the study@ after providing an exhaustive description of what localisation means@ will focus on the localisation aspects relevant to the highly interactive applications heavily using context variables. The present document had an initial focus on the game industry but it does not restrict its scope to video games. On the contrary@ it will expand its vision beyond games@ aiming at identifying all other technical and economical sectors facing similar issues. Finally@ the present document will not provide an exhaustive analysis of advanced research projects and techniques@ but it will review the main existing or known areas of innovation and analyse whether they may help solving our problem.