The use of lines in such a way that the outline and primary aspects of an object emerge.
Drawing an image using contour lines without looking at your paper. (Multiple Drawings done in class from still lives & partners)
A continuous line drawing is produced without ever lifting the drawing instrument from the page. This means that, in addition to outlines and internal shapes, the pencil must move back and forth across the surface of the paper, with lines doubling back on each other, so that the drawing is one free-flowing, unbroken line. (Sketchbook Assignment)
A cross contour drawing contains parallel lines that run across the surface of an object (or radiate from a central point), such as those that appear on a topographical map or a digital wireframe.
The use of lines that are energetic, capture movement and gestures of action. (Multiple Drawings done in class from models projected on the screen)
The use of lines that describe the shape of an object and the interior detail. A contour drawing shows the outlines, shapes and edges of a scene, but omits fine detail, surface texture, color and tone
Additional Cool Cross Contour Drawings
Student Art Guide Page on Line Drawing
Figure Drawing Tool (Gesture Drawings done in class)