The U$.$S$.$ Social Security Administration $($SSA$)$ operates the federal government$$s social insurance program that covers $173$ million workers. There are $65$ million people receiving retirement, disability, or survivors$$ benefits from a $$920$ billion annual operating budget $($source: U$.$S$.$ Social Security Administration, www$.$ssa.gov$).$

Currently all social security tax contributions are invested in risk$-$free U$.$S$.$ Treasury bonds and bills, however under a proposed federal mandate, the SSA is launching Retirement.gov to allow workers and recipients to control how their contributions are invested. Retirement.gov would operate similar to HealthCare.gov where individuals can review and select a private sector investment management company to manage their retirement fund, similar to how private pensions, IRAs, and $401($K$)$ retirement funds operate. Retirement.gov is scheduled to launch in $24-$months.

Question to the Expert:

Is waterfall the best approach for this project? Assessing the advantages and disadvantages of waterfall projects, compose an informative argument for or against a waterfall approach to the Retirement.gov project.

Compose two example requirement statements for the Retirement.gov project.