LinkageDesigner, for parametrized mechanism modeling, works with Mathematicas symbolic calculation software to let users analyze, synthesize, and simulate linkages. The software detects nonfeasible and lock-up mechanisms while defining the model. Other features calculate translational velocity, angular velocity, and higher-order derivatives of any link and provide visualization and animation of linkages in Mathematica notebooks. Wolfram Research Inc., 100 Trade Center Dr., Champaign, IL 61820, (217) 398- 0700,