Mezo, I love how graciously you worded your comment. I totally agree with your point. My thought is that the break between periods of work is too great. I think Mezo's reference deals with accumulating the maximum 4 years experience once the MI is met. Kitty is still trying to meet the 1 year minimum MI requirement. See what you think. In OP 6 there is the following:
http://www.cic.gc.ca/english/resources/manuals/op/op06-eng.pdf
Note: Applicants must have at least one year of continuous full-time or equivalent paid work experience in at least one of the listed NOCs and not combined partial year experience in multiple NOCs.
Anticipated short breaks between jobs are acceptable. For example, if an applicant is employed in one occupation for a 4 month contract and before the end of that contract, has secured other employment that will begin shortly after the end of first contract, this break in continuity would be acceptable. The occupation must be listed in the MI.