1. According to the Minister's instructions, your application is eligible for processing if:
you have an offer of arranged employment, OR 
you are a foreign national who has been living legally in Canada for one year as a temporary foreign worker or an international student, OR 
you are a skilled worker who has at least one year of experience in one or more of the occupations listed here. 
If you have an offer of permanent employment from a Canadian employer, it can improve your chances of having your federal skilled worker application approved. 
Depending on your circumstances, the requirements for a valid offer of employment are different.
1) If you are currently working in Canada:
your current employer must have made an offer to give you a permanent job if you are accepted as a federal skilled worker, and 
your temporary work permit must be valid both when you apply for a permanent resident visa and when the visa is issued. 
In addition:
your work permit must have been confirmed by Human Resources and Social Development Canada (HRSDC) through a positive labour market opinion or 
you must be in a category that is exempt from an Arranged Employment Opinion 
in order for your offer of employment to be valid.
2) In all other cases: 
You must not be working in Canada and you either 
do not have a valid work permit or 
you have a work permit, but your circumstances are different from those described in the first example.