Complex systems of systems such as Smart Grids, Smart Cities, Smart homes/ buildings, Active Assisted Living (AAL) systems etc call for cooperation between experts from several different domains (e.g. home automation, health, energy, telematics, IT etc.).

In the specification and design of such systems, standards play an essential role to obtain interoperable, safe, secure and cost effective solutions. Thus, a common cooperation platform, including a collaboration framework (terminology, quality guidelines, workflows, etc.), for involved stakeholders is needed both in project development as well as in standardization work.

The work with the IEC 62559 standard series used the IEC PAS 62559:2008, IntelliGrid methodology for developing requirements for energy systems, as a starting point.

IEC PAS 62559 defined a methodology for power system domain experts to determine and describe their user requirements for automation systems, based on their utility business needs. Since its appeareance in January 2008, the IEC PAS 62559 use case methodology has been increasingly used within standardization and the need for a framework was recognized, e.g. for IEC experts to provide use cases in a consistent manner.

The IEC SMB SG3 recommendation 7, approved by the SMB at its February 2010 meeting (SMB/4204/DL, Decision 137/10) requesting the urgent delivery of a generic use case repository for all Smart Grid applications introduced a need to transform the IEC PAS 62559 to an IEC 62559 standard to support the development of an IEC use case repository and to provide support for the use case methodology in general.

The IEC PAS 62559:2008, as well as experiences from the many activities which have already used it, provide central input to a full IEC 62559 standard series.

This series will among other be the basis for a common use case management repository in order to gather use cases within IEC on a common collaborative platform and to organize a harmonization of use cases in order to develop and provide broadly accepted generic use cases as basis for the further standardization work.

The new IEC 62559-series of standards is to support the standardization bodies needs to create and manage a common use case repository (parts 1-3). In contrast to the original scope of IEC PAS 62559:2008, this series of standards intents to be widely applicable for the development of different kinds of technical systems also outside the Smart Grid domain. But, as the development of the series was based on the the IEC PAS 62559, most examples come so far from the electrical energy supply domain of Smart Grids.

IEC 62559 series of standards – Overview and relationships

The Figure below provides an overview of the intended first parts of the IEC 62559 series mainly describing the relation between part 2 (the use case template), part 3 (the XML import/export format) and the common use case repository.

Part 1 – Concept and processes in standardization

This part (described in this document) of the IEC 62559 “Use case approach” provides the basis for a common use case management repository in order to gather use cases within IEC on a common collaborative platform and to organize a harmonization of use cases in order to provide broadly accepted generic use cases as basis for the further standardization work. It describes processes and provides basics for the use case approach.

Part 2 – Definition of the templates for use cases, actor list and requirements list

The second part of IEC 62559 “Use case methodology” defines the structure of a use case template, an actor list and a list for requirements. The document is mainly based on the previous IEC/PAS 62559 specification.

Part 3 – Definition of Use Case template artifacts into an XML serialized format

Based on IEC 62559 – part 2 template, this document defines the required core concepts and their serialization into XML syntactic format of a use case template, an actor list and list for detailed requirements. The XML format is used to transfer the content of the template to other engineering systems (e.g. based on UML). It is intended to develop a UML profile definition based on this part in future.

Part 4 – Best Practices in Use Case Development for IEC processes and company projects

Part 4 maintains the application of the use case methodology in the former IEC PAS 62559:2008-10 relating to company projects. This content is gathering recommendations around the application of the use case approach for project specific developments in a broader sense whereas parts 1 to 3 are concentrating on the application within standardization, the use case template and the management of an IEC use case repository.