Abstract
IGA replaces traditional Finite Elements by watertight structures of 3-variate NURBS. The introduction of NURBS in FEA allows accurate representation of CAD-shapes in FEA. However, efficient technology for establishing watertight IGA-models from CAD-models has to be developed, local refinement of IGA-models has to be improved, and direct GPU-based visualization of IGA-models has to be developed. IGA potentially simplifies analysis of as-is models as the path from measurement through CAD to analysis is shortened.