The DTI publication 'Code of Practical Guidance for Packers and Import
ers' provides detailed advice on the establishment of effective statis
tical process control (SPC) systems to ensure efficient and effective
compliance with the recruitments of the Average System for food and dr
ink organizations. Since this document is non-mandatory, however many
organizations opt not to adopt such systems, and rely instead upon the
ir checkweigher as a last line of defence. In many cases, this is beca
use of the apparent complexity of the systems to the non-statistically
trained. This paper presents a case study which demonstrates that sim
ple, manual SPC systems involve very little statistical knowledge to e
stablish and operate. Such systems, it is argued, can reduce unnecessa
ry checkweigher rejections and product giveaway, assist with Trading S
tandards inspections and improve customer confidence. (C) 1998 Elsevie
r Science Ltd. All rights reserved.