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  1. Background & Context: Many efforts have been dedicated to building computer science (CS) teacher capacity through offering professional development (PD) programs. Previous reviews indicated the need to offer more continual support for teachers. Recent research has shifted its focus to scaling up PD and sustaining teaching capacity by establishing PLCs for CS teachers. Objective: This study aims to conduct a systematic literature review of recent research on K-12 CS teacher PD, with an explicit exploration of PLCs. Method: Based on 48 selected articles of 41 programs, this study explored features that contributed to the effectiveness of PD, including (1) PD goals, (2) theoretical frameworks and PD models, (3) curriculum and pedagogy, (4) programming tools, (5) program structure and approach, and (6) PD evaluation. We also examined whether and how these programs were dedicated to establishing PLCs. Findings: Findings indicate a considerable increase in the number of studies on CS teacher PD. More programs saw the promising roles of PLCs and explored a variety of approaches for community building and promoting teacher learning. Implications: PLCs have immense potential for teacher development, including breaking teacher isolation and fostering collaboration. More research can enlighten the efforts for CS teacher preparation and development. 
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  2. null (Ed.)
    This paper presents an experience report from an NSF-funded researcher-practitioner partnership (RPP) project. Based on a collaboration among two public research universities and three urban school districts in the Northeast USA, the goal of the project is to establish an institutionalized middle school computer science curriculum in the districts. The CS curriculum incorporates digital literacy skills as an integral aspect of learning computer science, and is based on students developing mobile apps that provide social and community good. Here, we share our professional learning process during the project's first year, which had been developed iteratively and dynamically adjusted to a remote format in response to exigencies of Spring 2020. The paper includes analysis of three data sets from teacher-participants: (1) their questions about the nature of the project, which we categorized into three levels: project, district and teacher levels. These questions bridge the visions and knowledge among different groups of the project partners; (2) analysis of semi-structured interview conversations with more than half of the teacher-participants; and (3) teacher survey responses. Our findings include two recommendations: that RPP projects elicit teacher questions to illuminate the three levels identified, and use strategies that engage teachers in designing a professional learning process for teaching computer science. 
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