Harris matrix
The Harris Matrix or Harris-Winchester Matrix is a method of recording and interpreting archaeological sites. It was invented in 1973 by Dr. Edward C. Harris during his work at Winchester. He used to the laws of superpositoning to develop a diagrammatic way to represent stratigraphic relationships between features. Each numbered context on the site is shown graphically along with its chronological relationship to all the other contexts, where known.
The latest contexts sit at the top of the matrix and the earliest at the bottom with straight lines linking them together via all the intermediate contexts. The matrix can thus show the chronological relationship between any two contexts. As large sites invariably create complex matrices, archaeologists nowadays use computer programs to create the diagrams for them.
Martin Carver developed a similar method known as the Carver matrix.