further operations appear: TURN RIGHT, TURN LEFT, 
TURN UP, TURN DOWN, STEP UP, STEP DOWN, 
STEP IN, STEP OUT, RETURN NEW, RETURN OLD. 
These operations simulate walking through the environment. 
The RETURN light buttons permit the user to end his visual 
sequence at the point he entered perspective of at the point 
he terminated the sequence. 
OPERate, QUALIFy and ASSIGN are modes that put the 
machine into the respective operational context. A 
further button must be pushed to describe the interest 
area. 
SURFACE allows the six surfaces of an element to receive 
one of four properties or wothout the attribute of ACCESS: 
TRANSPARENT, SOLID, PARTITION, ABSENT. Although 
SOLID and PARTITION have the same physical properties, 
they permit the user to differentiate between a unit 
(apartment, office, store, etc.) and an element or sub- 
division (bedroom, conference room, storage space, etc.) 
CIRCulation mode, ENVIRonment mode, ACTivities mode 
and SITE mode are presently being designed and implemen- 
ted. 
USER mode has been designed using a neighborhood as the 
set of elements to be examined or labeled. The population 
contents of a neighborhood can be explicitly described in 
density, income, ethnic group, sex, and age groups. The 
implicit interaction of neighborhoods has not been imple - 
mented. The system presently permits the description and 
location of one hundred neighborhoods. 
ELEMent mode has seven qualitative attributes applicable 
on a per-element (cube) basis: VISUAL PRIVACY / 
ISOLATION, ACOUSTICAL PRIVACY / ISOLATION, 
OUTDOOR ACCESS, DIRECT ACCESS, DIRECT. LIGHT. / 
SUN, INTENSE, DEAD SPACE. These spacial qualities 
areimplicitly assigned by the machine. For example, an 
element that has an exterior surface with access will be 
implicitly ascribed the quality OUTDOOR ACCESS. On 
the other hand, the user can explicitly describe, for 
example, VISUAL PRIVACY to an element. Should this 
element be on a main circulation route and have a 
TRANSPARENT surface facing this route - CONFLICT will 
occur. 
OUTPUT mode takes the image on the scope and prints it. 
This is not plotted but printed with dots,‘ dashes and 
various characters. The printer is fast and can rapidly 
describe the associated symbols, qualities, and surfaces 
in text form. 
RESTART reinitializes the system permitting the user to 
study new departures and different assumptions, 
STORE has seven light buttons: WRITE DISK, READ DISK, 
WRITE TAPE, READ TAPE, NEW NAME, DELETE NAME, 
IN TIME. READ and WRITE DISK have ten sequential 
files that the user can NAME as he choses. He can store 
preliminary designs and retrieve them by name. For 
example, at a certain stage he can store his project on 
disk, name it HARRY, and proceed on a new tact. Later 
he can return to a previous state to redepart in a different 
direction. In this case, he READs DISK, HARRY. Should 
the user not remember a preliminary design by name, he 
can retrieve it IN TIME: 
"1 AM INTERESTED IN THE PROJECT AS IT"STOOD 
10 OR 15 MINUTES AGO." 
When the user is finished WRITE TAPE stores the ten files, 
the criteria, and the symbols to be reused at a later date. 
END terminates the job and gives the user a diagnostic of 
how many minutes he ran and how many decisions he made 
PANIC, JURY, DICTionary, HISTory are instructional 
modes and are in their infancy of design. They are inten- 
ded to make the user-machine interface as conversational 
and personal as possible, permitting the user to articulate 
himself in the privacy of himself, 
SYMbol buttons permit the user to establish his own 
vocabulary. There are six "SYM”S"; each can hold sixteen 
user or machine defined symbols. Symbols describe 
activities, uses, or composite qualifications. The user 
can draw upon a dictionary of predefined symbols (nursery 
school, library, bank, etc.) or he can define his own, 
relating themto any combination of the available sixteen 
use generics (daily commercial, education, service, 
private, etc.). A symbol can be stored in any one or more 
of the six "SYM" buttons. For example: he could put all 
educational symbols in SYM2 and all symbols relating to 
little children in SYM4. In this case, the symbol NURSERY 
SCHOOL would probably be under both symbol buttons. 
Once the symbols are defined they can be assigned to 
units. Presently, the system cam accept sixty four symbols; 
each unit can have one associated symbol. 
ARCH + 1(1968) H.4