Regina said:Actually it is said somewhere on www.cic.gc.ca
To be eligible to enter the pool, Express Entry candidates must have skilled work experience in a National Occupational Code (NOC) 0, A or B occupation. Jobs offered to candidates in the pool must be in one of these categories.
Job offers are also subject to the LMIA requirements in place at that time.
Candidates must also meet the minimum language requirements (for NOC 0 and A occupations: CLB 7; for NOC B occupations: CLB 5).