Hi Minitehnicus,
What is important in QRQC is not exactly the type of problem solving tool you use.
It is rather the organisation implemented to handle problems on the shopfloor that is the scope of QRQC.
QRQC, originally from Nissan, has been modified in France by Valeo which added a few more principles to it.
According to Valeo, there are 6 pillars in QRQC :
1/ Real Workplace : investigating problems on the shopfloor where they arise with the people involved (operator, Line leader ...)
Trying to reproduce the problem ...
2/ Quick reaction : deal with problems as soon as they arise e.g. within 24Hrs (for simple problems)
3/ Real parts : investigating NOK parts & OK parts to identify the problem
4/ Logical Thinking : using whatever rational problem solving method
5/ Real data : using data & facts instead of opinions (e.g. to determine if standards are met, to plot NOK parts qty against time, shifts or mould cavity No. ....) to help investigating the problem
6/ On the job coaching : management coaches QRQC teams to improve their understanding of QRQC & efficiency
Concerning the QRQC organisation, there are 3 QRQC levels :
1/ Line QRQC (for simple problems arising at the workstation ...)
The team leader stops the line and gathers with team members to investigate & solve the problem on the spot or within maximum 24hrs. All data related to the problem are written on a QRQC board (date, time, part No, NOK Qty, defect description and once known, causes & corrective actions)
=> Usually simple problems are the ones where some characteristics have derived from standard
2/ Autonomous Production Unit (APU) QRQC
Problems not solved by line QRQCs (usually more complicated problems where some standard is not relevant) and daily Customer complaints related to the APU are dealt following a much more formal problem solving method (e.g. FTA, 5 Whys ...) by a problem solving multi-disciplinary team within 1 or 2 weeks
Daily meetings around the APU QRQC board are held to monitor/follow up the QRQCs progress with the APU manager, the APU Quality engineer(s), QRQC leaders ....
3/ Plant QRQC
Almost the same as the former, but for critical customer complaints (e.g. for safety & regulation NOK characteristics ....)
Meeting are held around the plant QRQC board and involve the plant manager, the quality manager, the production manager, QRQC leaders ....
But beside this specific Valeo approach, what is important is to understand the basics of QRQC and adapt it to your production organisation & maturity. In fact, many companies have their own approach to QRQC. So you can find contradictory training material concerning QRQC depending what company it originates from.
Some links in French inspired from Valeo for further explanations :
http://www.consulting-centre.com/iso_album/qrqc_conference1.pdf
http://www.bcf-consultants.fr/pdf/exemple-qrqc.pdf
Hope this helps
Francois