The Calendaring and Scheduling standards, defined in RFC's 2445, 2446, and 2447 were released in November 1998, and further described in RFC 3283. They were designed to progress the level of interoperability between dissimilar calendaring and scheduling systems. The Calendaring and Scheduling Core Object Specification, iCalendar, succeeded in establishing itself as the common format for exchanging calendaring information across the Internet. On the other hand, only basic interoperability as been achieved between different scheduling systems. The Calsify working group is chartered to: (1) Publish the interoperability issues that have arisen between calendaring and scheduling systems, as well as document the usage of iCalendar by other specifications. (2) Revise the Calendaring and Scheduling standards to advance the state of interoperable calendaring and scheduling by addressing the published interoperability issues. As far as it is possible, the working group will ensure backwards compatibility with widely deployed implementations and other specifications that use it. (3) Clarify the registration process for iCalendar extensions (i.e., the current core object specification only provides a template to register new properties). (4) Advance the Calendaring and Scheduling standards to Draft Standard. (5) Work on transition (upgrade or versioning) mechanisms for calendar data exchange. Proposing an XML representation or transformation of iCalendar objects is out of the scope of this working group.