3.1. Introduction3.2. Hillerborg and Colleagues' Fictitious Crack Model3.3. The Principle of Superposition3.4. The Reciprocity Principle3.5. The Singularity Issue3.6. Crack Path Modeling with Dual Nodes3.7. The Remeshing Scheme for an Arbitrary Crack Path3.8. The Solution Scheme for Incremental Stress Analysis