 WG-88 focussed on the specification and standardization of On-Board Weight and Balance Systems 
(OBWBS), an ongoing effort for what is considered to be a feasible option.WG-94 focussed on standards and operational conditions for a TOPMS; it WG-94 was concluded early 2017, considering that TOPMS was not feasible, in particular due to limitations in technology and data availability.A version suitable for detecting gross errors, which can be integrated in existing avionics, has been proposed by National Aerospace Laboratory (NLR), KLM, and Martinair.