Be consistent with existing guidance

>Projects within investments are encouraged to use modular development principles. All projects (regardless 
>of whether they use modular development principles) must produce usable functionality at intervals of no 
>more than six months. 

See 2016 IT Budget Guidance (http://www.whitehouse.gov/sites/default/files/omb/assets/egov_docs/fy_2016_guidance_06272014.pdf), page 24.