ERA software maintenance facility underwent a complete upgrade to the latest software development tools at the time. ERA Operation Plan The MPTE is used for composing an ERA Operations Plan (EOP), based on the Mission Plan for the Russian Segment, which contains all information about the segment to plan a detailed ERA mission. An ERA Operation Plan, in general, contains: ERA Actions Auto Sequences, the sequence of commands which will be executed automatically by the ECC ERA Tasks, a subset of the Auto Sequence composed of logical groups of individual commands or actions ERA Uplinkable Command List (EUCL), one or more auto sequences, where are ERA commands are the implementation of planned actions to control one of the ERA's subsystems European Robotic Arm simulator The European Robotic Arm Simulator, comprised completely of a digital simulator, that uses the EuroSim program, is designed to train astronauts to use the ERA. The simulator is set up such that an astronaut can operate a command console while standing in front of a large realistic visualization. The ERA simulator includes the reuse of existing software that was created to aid in the development of the arm itself, such as the ERA Simulator Facility, as well as existing software such as the Image Generation Subsystem of EuroSim. Refresher Trainer To complement the training astronauts receive on the ground, The Refresher Trainer provides the crew on board the ISS with the capability to rehearse their missions. The Refresher Trainer is a software application running on a laptop computer; it contains simulations for internal and external Man Machine Interfaces, session manager to prepare, store and replay mission sessions, as well as all relevant reference documents on the ERA. Acceptance testing on the Refresher Trainer was completed in 2006. Test models Weightlessness Environment Test Model Commonly referred to as the WET model, the Weightless Environment Test model was a mockup of the ERA that was located at the Gagarin Cosmonaut Training Center (GCTC), in Moscow, Russia. Attached to a mockup of Nauka, both were submerged in a large pool in the Hydrolab facility. Here it was used by astronauts, for the testing of the arm in a simulated weightless environment. Astronauts would don suites designed to mimic the conditions of wearing a spacesuit, as well as the weightless environment. The WET model was also used in the training of astronauts, including practice of the choreography of arm motion