Have your spare shoelaces disappeared? Use a length of string, wool or twine instead. For women's shoes, ribbon makes a pretty substitute, especially if it's lace or satin.
Here's how to retie a broken shoelace. Remove the lace, join the two pieces together with a reef knot, and estimate where the knot will fall in the laced shoe. Put the knot there and lace from that point outwards in both directions.