“…Just a few examples of professional development activities are formal or informal learning communities among teachers (e.g., Little, 1999Little, , 2002Mathews, Holt, & Arrambide, 2014;McLaughlin & Talbert, 1993;Stein, Smith, & Silver, 1999), co-teaching and mentoring (Pancsofar & Petroff, 2013;Schifter & Fosnot, 1993), reflecting on lessons (Diamond, Maerten-Rivera, Rohrer, & Lee, 2014;Schifter & Fosnot, 1993), group discussions (Ball & Cohen,1999;Gearhart & Wolf, 1994), study groups (Greenleaf, Schoenbach, Cziko, & Mueller, 2001), own inquiry/action research (Guskey, 2000;Nadelson et al, 2013), and designing new curricula (Guskey, 2000;Little, 1993). Desimone (2009) suggests that professional development effectiveness should be measured, not by the type of professional development (e.g., workshop or study group), but by the characteristics of the activities (e.g., content focus, coherence, and duration) that help increase teacher learning, change practice, and improve student outcomes.…”