Gene Key 19 sits on the same numbering that Human Design and, before it, the I Ching use. It shares its number with Human Design Gate 19 ("Sensing Needs"), carried over intact from that system rather than derived independently, and beneath both lies I Ching hexagram 19, Approach. Rudd retained from Human Design the sixty-four positions, their King Wen hexagram numbers, the arrangement of the hexagrams around a zodiacal wheel, and the pairing of each key with a "programming partner" opposite it on that wheel; he set aside the bodygraph, the types and the strategies, and added the Shadow-Gift-Siddhi spectrum. Three datable layers therefore stack here and are best kept distinct: an ancient hexagram, a 1987 Human Design gate, and a 2009 Gene Keys reading.
Richard Rudd's own reading of Gene Key 19 moves from the shadow of Co Dependence, needs pursued through others rather than named directly, through the gift of Sensitivity, an accurate feel for what a group actually needs, to the siddhi of Sacrifice. Rudd ties the arc to the key's I Ching correspondent, Hexagram 19, Approach, whose received image of the great drawing benevolently near to the small he reads as true sensitivity to need, rather than dependence, as the basis of the approach.