| Relationships | Role | Relationship Start | Relationship End |
| First Chicago Corporation | Parent | 12/31/1970 | 10/15/1982 |
| Hospital Research Corporation | Subsidary | 12/31/1976 | 12/7/1978 |
| Systemetrics Corporation | Subsidary | 12/31/1976 | 12/7/1978 |
| Real Estate Research Corporation | Subsidary | 12/31/1976 | 11/29/1978 |
| Urbametrics Corporation | Subsidary | 12/31/1976 | 11/22/1978 |
| Real Estate Research Corporation | Subsidary | 12/31/1976 | 11/22/1978 |
| Real Estate Research Corporation | Subsidary | 12/31/1976 | 11/3/1978 |