Transaction Isolation Levels

I was trying to think of an easy way to memorise/understand these.  What do others think of this approach?

Transaction Isolation Level	Lost Update	Dirty Read	Non-Repeatable Read	Phantom Reads	Shared Locks	Schema Stability Lock	Alternate Reality	Update Conflicts
Read committed	N	N	Y	Y	Acquired for read, released immediately		N
Read uncommitted	N	Y	Y	Y	Not acquired for read	Acquired	N
Repeatable read	N	N	N	Y	Acquired for read, held for duration		N
Serializable	N	N	N	N	Locks range or entire table		N
Snapshot	N	N	N	N	Not acquired for read		Y	Y
Read committed snapshot	N	N	Y	Y	Not acquired for read		Y	N