INQUIRY subsystem

Cross Reference file. The connection table in the Registry Structure file is accessed for a given NSC Number by the IRN present in the NSC record of the Cross Reference file. The name and address and other control information for a given supplier in the Miscellaneous file is accessed by the supplier code in the NSC record for a given compound. The NSC Numbers of all the compounds scheduled for shipment on a specific Material Shipping List (MSL) is accessed for a specific carton of samples by the MSL number in the MSL record in the Miscellaneous file. As will be described later, the INQUIRY subsystem uses the search Indexes and Inverted lists to be lead to NSC Numbers and their associated data in response to full structure or substructure searches. (See Table 2 for the size and growth rate of the DR D CIS files.)... 

The CIS Inquiry subsystem was designed to be totally Integrated Into the processing system and to use state of the art techniques to allow users to regain the "feel" for the file lost In the previous batch system while retaining the flexibility and accuracy that Iterative (atom by atom) searching of a detailed connection table allowed. The system developed uses data extracted from the structural and non-structural data files and Indexes It In such a way that on-line. Interactive searching from a remote terminal Is practical. 

Following the same approach as the development of the system, the system representation and identification of boundaries between subsystems/constituents of the system must support the above listed constraints. According to the Singerian inquiry model, the safety case should be stractured around main safely goals and objectives of the system, and then decomposed into lower level goals and requirements. 

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