This paper describes the user interface related services of the HELIOS project. The design and implementation of efficient user interfaces is a prerequisite for successful introduction of computer support in health care ward units. Design principles must be based on a basic understanding of cognitive aspects of human-computer interaction, as well as on detailed knowledge about the specific needs and requirements of the health care professionals. In the HELIOS project, a style guide for design of user interfaces has been developed. The style guide defines detailed design guide-lines together with a set of interface elements specified for the ward domain. Development tools for construction and implementation of user interfaces to ward applications have been developed and integrated into the HELIOS SEE. The tools are based on the TeleUSE product, which has been extended and adjusted to the HELIOS specifications. A set of new widgets, designed to implement health care interface elements, has been incorporated into the development tool.