1. Scattering experiment and structure functions : particles and the correlation function of small-angle scattering -- 2. Chord length distribution densities of selected elementary geometric figures -- 3. Chord length distributions of infinitely long cylinders -- 4. Particle-to-particle interference : a useful tool -- 5. Scattering patterns and structure functions of Boolean models -- 6. The dead leaves model -- 7. Tessellations, fragment particles and puzzles -- 8. Volume fraction of random two-phase samples for a fixed order range L form (r,L) -- 9. Interrelations between the moments of the chord length distributions of random two-phase systems -- 10. Exercises on problems of particle characterization : examples.