Borko (US) will discuss issues related to the conceptualization, design, and use of artifact-based instruments for measuring instructional practice. She will draw from her own programs of research to develop and study teacher-generated collections of instructional materials, student work, and reflective comments such as the Scoop Notebook (Martinez, Borko & Stecher, 2012) and the work of other researchers who have examined the use of artifact-based measures in their studies of classroom practices (e.g., the Instructional Quality Assessment [IQA], Matsumura et al., 2008). She will consider, for example, the potential of artifact-based instruments to illuminate features of instruction that are difficult to capture with more commonly used instruments such as surveys and observation protocols. Her presentation will address conceptual and technical challenges in developing artifact-based instruments, and issues such as the training of raters and number of raters needed to yield reliable estimates. She will also consider the potential appropriateness of artifact-based measures for a variety of purposes such as teacher evaluation and professional development.