What are Defect and Defective Pieces and How these are measured?

The parameter that decides whether a garment is quality garment or not is called as Defect.
When no. of defects in a garment is high it seemed as worse quality garment and when defects
are less then it is a better quality garment. Definition of defect and defective pieces has been
explained below.
Defects – Defects are all those non-conformances that are not acceptable by end customer. Like
imbalanced shape of the garment, broken button or other trims, holes in fabrics, slip stitch,
broken seam etc. In a defective garment there may be more than one defect.
Defective Pieces – Defective pieces are those pieces, which are separated for alteration during
checking may be for any causes.
For the quantitative measure there is two measuring unit as Defects per hundred units and
percentage defective.
Defects per hundred units (DHU) – number of total defects in 100 checked garments. The
formula for calculating DHU is
DHU = Total no. of defects found X 100 / Total pieces checked
Percent Defective (%) – total number of defective pieces in 100 checked garments.
Percentage defective = Total no. of defective pieces X 100 / Total pieces checked
Example: Suppose in a day one table checker checked 200 pieces. He found total 15 defective
pieces and in those 15 pieces total 60 defects were found. So, quality measure of that lot in terms
of DHU is 30 (60*100/200) and Percentage Defective is 7.5%.