We begin with several design considerations for creating residency or apprenticeship programs that impact the cost. We break this section into ongoing operating expenses and one-time planning costs. We then discuss considerations related to phasing in the program, as well as related work streams that are not accounted for in this cost model, but that are essential for residency or apprenticeship models to have their desired impact, such as the need for compensation parity with similarly credentialed elementary school educators, site and director level support to ensure coherence and an adequate supply of high-quality placement sites, and seamless articulation agreements across credentialing programs. Finally, we include a cost calculator tool that identifies the data you will need to calculate a per-educator cost estimate for your state, city, or region. (author abstract)