How to weave the "Discontinuous Supplementary Weft" technique?

Our weavers use various weaving techniques. In the "Discontinuous Supplementary Weft" technique, two or more coloured pattern threads are used to make the pattern. The weaver adds the coloured thread by hand as opposed to using a shuttle. This technique is very time consuming, sometimes a weaver can only weave a few centimetres a day. The wider the cloth, the longer it takes.