If the movement of a particle causes delayed movement in its neighbour we have a wave. Although waves may look similar, their mechanisms may be entirely different and we concentrate on the force causing the particles of matter to move. Incorporating new graphics this updated program shows: * Transverse waves, tension waves such as ripples, gravity waves, longitudinal or push waves, shear and torsional waves; * Characteristics, amplitude, freq. vel. period; * V = nL is demystified with a passing train; * Velocity, refraction, reflection, superposition, diffraction interference and standing waves. With over fifty activities in the teacher's notes, this program is a veritable opus to waves and their properties.