A direct requirement matrix shows the units of quantity of raw materials and intermediate products required for product manufacture. The matrix can be derived from the gozintograph and an overall requirement matrix can be created.
Definition / explanation
The direct requirement matrix is a square matrix with the same number of rows and columns. The lines show the number of pieces of products or raw materials that are contained in another product. The values in the columns in turn show the number of pieces of other products or raw materials that are contained in a product.
It stands P for the end product, Z1 to Zn for the intermediate products and R1 to Rn for the raw materials. This order is observed in the columns and rows.
Important properties of the direct demand matrix:
- there are only zeros in the main diagonal, since the same types of parts meet there
- the zeros in the columns always indicate raw materials or materials
- The zeros in the lines indicate the finished products
- the upper triangular matrix above the main diagonal is an indication that this is an ongoing process
- the lower triangular matrix is a feedback production process