A consolidation of reference material needed to design, analyze and evaluate imaging system performance. The information is integrated from a wide range of subjects in which the analyst much be conversant: target characterization, atmospheric effects, optics and detectors, amongst others. Contents: Ch. 1: Introduction Ch. 2: IR Imaging System Evolution Ch. 3: Radiometry Ch. 4: MTF Theory Ch. 5: Common Module Systems Ch. 6: EOMUX Systems Ch. 7: EMUX Systems Ch. 8: Staring Array Systems Ch. 9: Line Scanners Ch. 10: Two-Dimensional MTF Ch. 11: Sampling Ch. 12: Imaging Processing Ch. 13: Resolution Ch. 14: Image Quality Ch. 15: Atmospheric Transmittance Ch. 16: Atmospheric MTF Ch. 17: Target Signatures Ch. 18: Sensitivity and Noise Ch. 19: System Performance Models Ch. 20: Target Discrimination Ch. 21: Range Prediction