Here is a format of "Affidavit of Experience" for I-140 from co-worker, if you cannot get letter from your employer. AFFIDAVIT OF EXPERIENCE (IF Person is in the U.S.) I, (Name of Person) being duly sworn, depose and say that: (1) I presently reside at ____________________________________________________. (2) I am a citizen of _______________________________________. (3) I was employed by A-Z company of India in Mumbai, India from September 1991 to May 2001 as Senior Computer Programmer in the Systems Department. (4) Mr/Ms. (name of Employee) worked at A-Z company of India from July 1991 to May 1999. (5) During the period from October 1991 to May 1999, I worked with Mr./Ms. (name of employee), who was a Senior Software Engineer in the Systems Department. (6) Mr./Ms (name of employee) ’s duties included designing and developing software and databases systems applications and database administration, utilizing several programming tools such as Oracle 7.2.3, SQL, SQL/PL, Weblogic, ASP, ASP.NET, Crystal Reports, Forms 3.0, Developer, C, C++, Java, JavaScript, FoxPro, Windows NT/2000/95 and Solaris 2.6 (Unix) environment. He was successful in developing, implementing, training and converting systems in the above languages and tools. (7) During this period, Mr./Ms. (name of employee) showed a high degree of proficiency and professionalism in his work. I confirm that the above information is true and correct. _______________________ (Name of Person) Sworn to and subscribed before me this ______ day of May, 2003. ______________________________ Notary Public