I guess this is all set to change starting 01 Jan 2013.
http://gazette.gc.ca/rp-pr/p1/2012/2012-08-18/html/reg2-eng.html
The CEC regulations currently allow applicants to compensate for a lower level in one language ability with a higher level in another, resulting in a process that is complicated and confusing for both applicants and visa officers. In researching the introduction of language thresholds to the FSWC, CIC’s panel of language experts and designated third-party language testing agencies strongly recommended applying the threshold across all four abilities (reading, writing, oral comprehension and speaking). Accordingly, it is proposed that a minimum language threshold would be required in each of the four abilities for applicants to the CEC. As with the FSWC, the proposed Regulations would grant the Minister the authority to set the language threshold. Initially, it is anticipated that the threshold would be set at CLB/NCLC 7, which corresponds to having “adequate intermediate proficiency” in speaking, oral comprehension, reading and writing for NOC 0 and A applicants and CLB/NCLC 5, or “initial intermediate” proficiency in each ability for NOC B applicants.