The Simulation Model Portability is a standard for simulation models developed by ESA together with various stakeholders in the European Space Industry.
The first version, also known as SMI standard, was implemented in SIMSAT and EuroSim, simulator infrastructures in use at various ESA locations. The second version, also known as SMP2, is currently at version 1.2.
The ECSS has now taken the lead for further iterations of the SMP2 standard. The ECSS code for this standard is E-TM-40-07. The E-TM-40-07 is being finalised and will go out for public review.
References
Simulation Model Portability Wikipedia(Text) CC BY-SA