Most residual speech errors (RSEs) involve abnormal positioning or movement of the tongue. However, it is riot possible under normal circumstances to view directly the actions of the tongue during production of these distorted articulations. The visually inaccessible location of the tongue can often make precise diagnosis difficult in cases of RSEs, and intervention can be a particular challenge for clinicians when speech errors persist in older children and adults. Electropalatography (EPG) is a technique that can provide objective and clinically relevant data about details of tongue articulation during speech. Furthermore, biofeedback with EPG offers the possibility of an effective intervention for RSEs. This tutorial provides an overview of EPG and describes how the technique can contribute to our knowledge and treatment of abnormal tongue-palate contact in older children and adults with RSEs. An illustrative case study of a child with RSEs affecting fricatives and affricates is included.