Key terms in problem management

My final take on the problem management section in MOF. The key terms section wrongly defines both a problem and root cause.
A problem is defined as:
"A scenario describing symptoms that have occurred in an IT service or system that threatens its availability or reliability."
A problem should be defined as:
"A scenario describing symptoms that have occurred in an IT service that threatens its effectiveness and efficiency."
Root cause is defined as:

"The specific reason that most directly contributes to the occurrence of an error."
Wrong! Direct and root should not be used in the same sentence and context! Root cause should be defined as:

"One of multiple reasons that specifies the underlying causes of an error, deduced either from visible or proximate causes."