On Wednesday, 21 April 1954, L. Ron Hubbard gave the following special Group Processing Sessions in Phoenix, Arizona:
| *5404C21 | GP Spec-1 | Exteriorization and Stabilization |
| 5404C21 | GP Spec-2 | Exteriorization and Stabilization (cont.) |
| *5404C21 | GP Spec-3 | Remedy of Havingness |
| 5404C21 | GP Spec-4 | Remedy of Havingness (cont.) |
| *5404C21 | GP Spec-5 | Certainty Assessment on All Dynamics |
| *5404C21 | GP Spec-6 | Processing on Certainty |
| *5404C21 | GP Spec-7 | Universes: Assessment |
| 5404C21 | GP Spec-8 | Universes: Assessment (cont.) |