[dhimes]

I don't have the references right in front of me but I'm pretty sure the 7 +/- 2 in Law six is now thought to be 5 +/- 2.

Wiki puts it at 4 +/- 1:

https://en.wikipedia.org/wiki/Short-term_memory

[k_]

Plus the associated illustration (on Laws of UX) seems to agree with you.

[azhenley]

Any of Nelson Cowan's recent papers on the topic are good references for this smaller working memory.