(1) In general The Commissioner of Social Security (in this section referred to as the Commissioner) shall develop and carry out experiments and demonstration projects designed to determine the relative advantages and disadvantages of
(A) various alternative methods of treating the work activity of individuals entitled to disability insurance benefits under section
423 of this title or to monthly insurance benefits under section
402 of this title based on such individuals disability (as defined in section
423 (d) of this title), including such methods as a reduction in benefits based on earnings, designed to encourage the return to work of such individuals;
(B) altering other limitations and conditions applicable to such individuals (including lengthening the trial work period (as defined in section
422 (c) of this title), altering the 24-month waiting period for hospital insurance benefits under section
426 of this title, altering the manner in which the program under this subchapter is administered, earlier referral of such individuals for rehabilitation, and greater use of employers and others to develop, perform, and otherwise stimulate new forms of rehabilitation); and
(C) implementing sliding scale benefit offsets using variations in
(i) the amount of the offset as a proportion of earned income;
(ii) the duration of the offset period; and
(iii) the method of determining the amount of income earned by such individuals,
to the end that savings will accrue to the Trust Funds, or to otherwise promote the objectives or facilitate the administration of this subchapter.