The Office of Management and Budget (OMB) may grant exceptions for classes of grants or recipients subject to the requirements of this part when exceptions are not prohibited by statute. However, in the interest of maximum uniformity, exceptions from the requirements of this part will be permitted only in unusual circumstances. SSA may apply more restrictive requirements to a class of recipients when approved by OMB. SSA may apply less restrictive requirements when awarding small awards, except for those requirements that are statutory. SSA may also make exceptions on a case-by-case basis.