Web Generalisation Services are now receiving considerable attention from the research community. In this context, interoperability has been identified as a crucial beneficiary of the Web Service concept. This has inspired the formation of a working group to establish consensus for Web Generalisation Services and to specify further technical requirements. The intent of this working group is to enable a higher degree of interoperability and thereby increase the possibilities for exchanging and sharing generalisation functionality over the Web. OGC’s WPS interface specification has been taken as a basis, since it provides a standardized means within the geo-spatial domain to establish processes such as generalisation. This paper reports the current status of the working group and the forthcoming work items.