Presentations in this session showed that a physically consistent precession should have to be considered in the near future based on an improved precession of the ecliptic. An IAU Working Group is needed to recommend a new precession model resulting from comparisons of the recent available models. Discussion about astronomical standards makes it clear that a strong coordination is required between the various sources of standards (IAU, IERS or IAG values) in order to improve consistency between the standards for astronomical or geophysical uses. An effort should be done in that sense by the representatives of these bodies in various Committees.