Structurally, crisp foods have a tendency to be cellular. When a force applied to such a cellular product, each cell ruptures, creating a sound and the overall rupture pattern produces an irregular frequency and amplitude signature (Duizer, 2004).The graphs in Fig. 2show multiple fracture events leading to a typical irregular jaggedness. The jagged pattern of the force time curve reflects the crispy behavior of the cassava crackers. Each peak on the force–deformation curve theoretically represents one cell being broken (Cheng et al., 2007).