Proposal to modify definitions 2.9 “ISOFIX position” and 2.24 “i-Size seating position”. The revised definition of ISOFIX position specifies which types of ISOFIX child restraint systems as defined in UN R44 and UN R129 may be installed. The definition of i-Size seating position clarifies that such positions are designed to accommodate i-Size child restraint systems as defined in UN R129. The modification bases these definitions on strength test requirements rather than child restraint system category.