Cube dependency has become an important aspect admins should be aware of within their models.
There is a good overview describing what it is and how to cater for it here:
http://publib.boulder.ibm.com/infocenter/ctm1/v9r5m0/index.jsp?topic=/com.ibm.swg.im.cognos.tm1_op.9.5.2.doc/tm1_op_id3833CubeDepenedcy_MN4002.html
