Does any one know what proof is acceptable for experience ? I have worked with two major employers -- from one , I have a very detailed letter mentioing my job description etc. From another I just have a summary letter showing my designation, start-end date and basic salary. They will not provide any detailed letter. For US Immigration, an affidavit from co-worker is often accepted. Does the same hold good for Canadian immigration ? Alternately, I came to US earlier on L1A visa through that employer and the job description are listed in petition to CIS. Is that considered as acceptable proof ?