We believe this set of tools will be of great interest to the community. It also provides a stepby-step algorithm (open for discussion) of how we chemists interpret connectivity and envisage internal coordinates. So far the algorithm has reliably provided Z-matrices for a plethora of chemical systems, from single molecules, to non-covalent and coordination complexes. Input from the community will be highly valued going into the future. X R :,I(j) X :,j -X R :,b(j) -M T :,:,j X R :,I(j)