Back to my original question, can I assess performance without assessing effectiveness and viceversa??
Why ISO specifies the 2 of them if they are so close related?
Looking back at the old standard (i.e. 2008), from clause 1 to 8, the word "performance" is noticeably used not in conjunction with "effectiveness". Even ISO 9000:2005 doesn't have a definition for "performance". Thanks to armani for bringing the issue re: performance and effectiveness.
I've noticed that in 2008 the phrase "improve the effectiveness of the QMS" was mentioned at least 3 times (in clauses 5.3b, 8.1c and 8.5.1) while the 2015 version has no mention of it (from clause 1 to 10).
IMHO the 2015 version would like to give us additional guidance by teaming up "performance" with "effectiveness". As if by saying, "effectiveness can only be determined or evaluated by obtaining measurable results (i.e definition of performance)"
Try to switch "measurable result" in place of "performance" in the statements of the 2015 version. It may bring some pondering.
Hope this makes sense or am I drinking too much coffee?