A 6-perspective BSC is OK!
Midas Sekgabo, Head - Strategy and Projects, Botswana
Hi Dawei, I tried to resort to the dictionary meaning of "perspective" and find it not very helpful.
In their book, "Translating Strategy into Action - the BSC", Kaplan and Norton indicate that:
"...the four perspectives should be considered a template, not a strait jacket. No mathematical theorem exist that four perspectives are both necessary and sufficient..."
This has left us in a compromising position as we now have to individually define the proper perspectives
, hence the point as raised by Richard. Test the new perspectives for causal relationship with the rest and if you have alignment - you have another day. Thought provoking though.