We have received a series of reversals and remands from the USCIS appeals office (“AAO”) where we had argued that the USCIS had erroneously and illegally revoked approved I-140 petitions. The grounds of appeal in the cases involved:
Failure to prove qualifications of employee because the documentation of experience was insufficient;
Successorship-in-interest of companies, where one company was acquired by another;
Legality of “roving jobs,” consulting positions that require periodic relocation.
We represented an IT consulting company and a Senior Software Engineer employed by them from the point forward where they received an RFE. USCIS issued a Request for Evidence (RFE) questioning accreditation of the Indian universities where the applicant received his degrees. We researched the universities in question and documented that both are highly regarded and world renowned institutions. Additionally, we received an expert opinion that noted that both universities were accredited at the time the applicant received his degrees.
We represented a client and her minor child. They had filed their I-485 applications as derivative applicants. Two months after the I-485 filing, the primary applicant, her husband died in a tragic accident. USCIS requested biometrics for all applicants, but she did not appear because she was informed that her I-485 application would not survive the death of the primary applicant. We filed a motion to reopen the case, showing that the applicant was and is legally entitled to survivor benefits under the Immigration and Nationality Act.
When an I-485 is accepted at the Service Center, requests for FD-258 FBI fingerprint checks, fingerprint fees, and G-325A consular background checks are made by USCIS. Responses to these requests come back to USCIS and must be matched up with the appropriate files held in staging. File Maintenance "file connects" these responses to the corresponding files.
Here are some experiences with regards to my entire track from NIW I-140 petition to I-485 approval. I had somewhat of an unique case, so if anyone here is in the same boat, this may be of help to you. I have done the entire process by myself, without an attorney, and long hours of research in the law library on U.S.C. Section 8.
Arrived to US in 1991 on J-1, not subject to section 212e, changed to F-1 on arrival. Became an H-1 in 2001 and filed for NIW in March of 2002, case was backlogged due to 9-11.
We were called upon to correct a situation. USCIS sent an RFE stating that the degree and field of study did not match with the labor certification requirements. The I-140 beneficiary had a degree in agricultural science. The employer's requirement in the labor certification was a BS degree in Computer Science, Engineering, and Mathematics.
We were hired to respond to an RFE. Client filed an EB2 I-140, where the PERM Petition required a Bachelor's and 5 years of experience. The client received an RFE in which USCIS argued the Beneficiary's degree, a Bachelor's in Commerce from India, equates to a 3-year degree and cannot be considered for an EB2 case. The Beneficiary possessed a four year Bachelor's Degree, however, this was not clearly established on his Degree. The client obtained his BS in Commerce before India switched to a standard 3-year program for his particular degree.
A beneficiary had two three-year bachelor degrees from India and consequently his I-140 petition was denied on the grounds that the beneficiary did not have a four-year bachelor's degree. We were retained after the denial. Our firm was successful in appealing and winning in less than one month. Of course, this case had unique facts. We cannot assume that all three-year degree cases will go trough this smoothly.
We discussed: Working concurrently with H-1 cap exempt and quota employers, immigration issues if we have a special needs (cerebral palsy) child, applied B-2 to main status while F-1 is expiring, Section 245(k) and illegal work, DETAILED DISCUSSION OF I-140 REVOCATION IMPLICATIONS INCLUDING AC21, impact on H-1 of reentry on advance parole, Section 13 green card for diplomats, who can co-sponsor affidavit of support I-864, proving cross chargeability, transfer of priority dates for a future job approval
An I-140 petition, or Immigrant Petition for Alien Worker, is filed to petition an alien worker to become a permanent resident in the United States. The employer must file an I-140 Petition on your behalf within 180 days from the date your Labor Certification is approved by the U. S. Department of Labor. An I-140 Petition may be filed without a Labor Certification where the beneficiary qualifies under EB-1 classification.

I have finished my first review of H-4 EAD Regulations (effective 26 May 2015). Here are the takeaway points:
This entry is now old law. The new law is at http://www.immigration.com/blogs/i-140-ead-regulations-effective-17-jan…
5 November 2015: After some flip flops, USCIS has gone back to allowing carry forward of priority dates even if I-140 is revoked by employer - as described in this discussion. So, we are good for now.
The current prediction that the priority dates for employment based green card applications are likely to retrogress again has brought a lot of speculation and questions from our clients and our community. Let me clarify some of the questions and concerns.
Q. What happens if my priority date ('PD') retrogresses while my I-485 is still pending?