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The Misconception Oriented Standards-based Assessment Resource for Teachers in Life Science (MOSART-LS) project develops rigorous Distractor Driven Multiple Choice assessment tools that aid in generating evidence-based measures of MSP projects' impact on K-8 teachers' life science subject-matter knowledge and relevant pedagogical content knowledge. The National Research Council's Science Standards and AAAS Science Benchmarks serve as a framework for the grade-appropriate content that teachers are expected to master. This work utilizes peer-reviewed research studies of student conceptions in order to generate specialized assessments. These assessments measure the degree to which teachers hold the accepted scientific view represented by each of the 31 K-8 Content Standards in life science. The project is developing 250 valid new items and gathering data from a nationally representative sample of 8000 students and their teachers, characterizing the content knowledge of both. Incorporation of these tests into the MOSART online assessment system will make administration easier and allow for the aggregation of data from participating MSPs.