Opportunistic functional group-based strategies

ACS Symposium Series American Chemical Society Washington, DC, 1977. 

There is no doubt that the part of LHASA which makes the most immediate impact on chemists is the graphics. He may draw in the structure that he is interested in analyzing using standard chemical conventions and all communication from the program to him is via structural diagrams. This manner of interfacing with the chemist-user was chosen because it has been shown that the rate at which he can assimilate chemical data is maximized if it is in the notation with which he is most familiar. 

When a multiple bond is desired, it is necessary only to trace over the single bond one (or two) additional times. LHASA responds by redrawing the bond as double (or triple). Indicating stereochemistry is essentially the same, the appropriate indicator (wedged or dotted) is chosen and the desired bond is traced with the stylus (see below). 

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