This webinar presented the what, why, and how of the National Household Education Survey (NHES) decisions to transition from a landline telephone survey to a mail survey after 2007 and from a mail survey to a web-first sequential mixed-mode survey for 2019. NHES is a set of cross-sectional household surveys that was started in 1991 by the National Center for Education Statistics within the U.S. Department of Education. The NHES mode transition story is also one of robust experimentation. The results of NHES experiments are applicable to other household studies. The webinar will discuss the motivations to transition modes, the decisions involved, and factors in decision-making, including experimental findings related to the redesign from phone to mail and the subsequent transition to sequential-mixed mode administration. Specifically, the webinar will discuss coverage and response declines in landline telephone surveys; redesign considerations and technical input; experimental pilot test and field test findings related to mode, contact strategies, and incentives; motivations to add web, web experiment and web test experimental findings; and the NHES:2019 sequential mixed-mode experiments. The webinar will use a Total Survey Error framework to discuss mode transitions and experimentation, situating decisions and experimental results in the context of sources of survey error; trade-offs in increases and reductions in types of survey error will be discussed.