The adopted MIDD Service Improvement Plan (SIP), which is the blueprint for MIDD 2, links to the MIDD 2 Implementation Plan and Evaluation Plan. Both the Implementation Plan and the Evaluation Plan were approved by the Council in early 2018. Together these three documents outline the mission of MIDD and address key aspects of MIDD, from funding, to services, to evaluation.

The MIDD 2 Service Improvement Plan (SIP) brought together extensive collaborative work by a diverse range of County and community stakeholders. Shaped by values and guiding principles and ongoing strategic feedback from the MIDD Oversight (now Advisory) Committee, a multistage community-driven process was undertaken to shape programming recommendations for MIDD 2. This process included:

Input from more than 1,000 King County residents

141 programming ideas generated through an open call for concepts

90 briefing papers analyzing potential new programming options

Diverse community review panels that sorted programming options for funding consideration

County staff then aligned recommendations and identified funding levels in light of amended policy goals for MIDD 2. Initial recommendations were released for public comment and stakeholder review in April 2016, with revised recommendations released and reviewed in May 2016. Final programmatic and funding recommendations were transmitted to the Council as part of the MIDD 2 SIP in August 2016, along with a range of other planned improvements to MIDD operations and evaluation.

The SIP was approved by King County Council via Ordinance 18406 in November 2016. Updates to the SIP as of mid-2017 are described in detail in the MIDD 2 Implementation and Evaluation Plans.