The ISO 9000 experiences of the same sample of organisations over a five year time period is examined in this paper. The responses to a questionnaire sent out at the end of 1999 to companies which had a reasonably long term experience with the ISO 9000 series quality system are analysed. These companies were ISO 9000 series certified before 1994 when the authors conducted their first survey on the same sample. The main aim is to explore the links between the motivation for undertaking the ISO 9000 series and continued certification, with the impact on the type of TQM practices that have been adopted after certification, and what kind of gains have been achieved. Challenges faced by these organisations over time are also addressed.