Abstract:This paper presents the Museum of Modern Art’s 2012–13 Jackson Pollock Conservation Project, an 18-month study and treatment focused on three of the museum’s large-scale paintings by Jackson Pollock: Number 1A, 1948, One: Number 31, 1950, and Echo: Number 25, 1951. The authors discuss the factors affecting decision-making in structuring each treatment. Material similarities and disparities among the pictures are compared as well as each picture’s condition and treatment history. The project illuminates the advantages and importance of collaborative study, both among conservators and between scientists and scholars, in forming and adapting treatment approaches.