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136 Youcef Bey, Christian Boitet and Kyo Kageura2007). This extends to less well-represented languages as well (Streiter et al. 2005a,2005b, 2006). As Streiter states (2006), “seemingly unstructured bottom-up cooperationbetween knowledgeable volunteers” has provided “new ideas on howscientific cooperation might be organised,” which will “influence the field of NLPin general.”Both the translation activities and the NLP-related activities including languageresource construction described above are made possible by the Internet,which allows people to meet, communicate and share a variety of multilingual information.It is therefore natural to expect the former activity to be made easierby the latter. For now, however, there is a dearth of online translation-aid toolsfor volunteer translators which would make use of a wide variety of online languageresources (Bey et al. 2006b). It is within this context that we have developedthe translation-aid system BEYTrans (Better Environment for Your Translation) tospecifically meet the needs of volunteer translation communities. The first versionof the system is currently available and used on an experimental basis.This chapter outlines the design of the BEYTrans system. In Section 2, webriefly introduce the different types of online volunteer translators and their needs.Section 3 postulates the basic desiderata for computer-aided translation (CAT)systems specifically for volunteer translator communities. Sections 4, 5 and 6 explainthe collaborative functions in BEYTrans for supporting community-basedtranslations, language resource management, user-oriented functions, and thesystem interface.2. Types and needs of online volunteer translatorsOnline volunteer translators can be divided into two basic types (Bey et al. 2006a,2006b):1. Translators involved in closely linked, mission-oriented translation communities:they work in strongly coordinated groups translating clearly defined setsof documents, most typically what can loosely be called technical documentation,such as Linux documentation (Traduc 2007), W3C specifications, andboth documentation and software (interface, messages, online help) of opensource products. Localisation of W3C consortium documents (W3C 2007)and Mozilla (Arabic Mozilla 2007; French Mozilla 2007) is supported by thiskind of volunteer translation community. In many cases, different translatorstranslate different parts of the same document, hence mutual coordinationand version control is required for this type of translation. We will call this typeof voluntary translation activity “community-based translation.” The BEY-