A Queueing Network Analyzer for manufacturing: QNA 3.3.

The Queueing Network Analyzer (QNA) is a software package developed at AT&T Bell Laboratories to calculate approximate performance measures for systems that can be modeled as queueing networks. This memorandum describes the principal features of QNA 3.3, a new version of QNA developed especially for analyzing manufacturing lines. In particular, this memorandum describes the QNA 3. 3 model and algorithm, including the model assumptions and the approximation methods, but not details about the software. Basic information for using the software and additional details about the software are contained in an accompanying memorandum by A. T. Seery and in the QNA 3.3 program comments. QNA 3. 3 is intended to provide rapid rough-cut estimates of capacity, WIP (work in process inventory) and production intervals (time spent in the system by products) during the early stages of designing a manufacturing line.