IEC TR 61968-900:2015(E) is a companion document to the official standard IEC 61968-9. It is written from the viewpoint of a software developer or systems integrator who is tasked with implementing IEC 61968-9. It is not intended as a complete description of this standard. For full details, please refer to IEC 61968-9. This technical report contains informative recommendations which may be used to guide implementations of IEC 61968-9 and IEC 61968-100. It does not attempt to be exhaustive. In particular, it focuses on the most common IEC 61968-9 interfaces and assumes the user is using web services or JMS as the underlying transport mechanism. If the user is using other systems or the transport services are something other than web services or JMS, the recommendations in this technical report may be less relevant but perhaps still useful.