Figure 1. Integrated CAD/NAST system. 

Legend:
1 - Design requirement specification
2 - Assembly expert
3 - Overall design knowledge base
4 - Design instance library
5 - Cost and analysis expert
6 - Manufacturing expert
7 - A pool of reference models to be tested
8 - Procedural algorithms
9 - Algorithm expert (system)
10 - Algorithm knowledge base
11 - Library of "proper" algorithms and parameter numerical values
12 - The current reference model for analysis
13 - Automated simulation program generator
14 - Simulation condition specification
15 - Simulation program runs
16 - Simulation results visualization and interpretation
17 - Evaluation and modification
18 - Consideration of another model from the selected pool
19 - The current model adjustment
20 - Simulation program refinement
21 - Simulation condition modification
22 - RESULT: acceptance of the design