Well-designed and -equipped teacher workspaces provide the opportunity to improve student achievement at every step of their K-12 education. Shared workspace enhances communication among teachers as they evaluate student performance individually and collectively, and share insights with one another. This paper addresses the key elements found in well-designed teachers' workspaces, including both classroom- and office-based workspaces; and highlights important development principles when designing these workspaces. Educational trends that have affected the rise of both classroom- and office-based workspace are briefly discussed. [This is an updated version of ED446427 (published in 2000).]