“…As no prior writing self-efficacy measure to the best of our knowledge focused on this particular process within academic writing (for review of existing writing self-efficacy measures, see Abdel Latif, 2021 ), we consulted the literature on synthesis writing ( Spivey and King, 1989 ; Segev-Miller, 2007 ; Solé et al, 2013 ; Vandermeulen et al, 2020a , b ) as well as on written task products used for comprehension assessment within multiple document literacy (e.g., Ferguson and Bråten, 2013 ; Barzilai and Ka’adan, 2017 ; Du and List, 2020 ; McCarthy et al, 2022 ; Kullberg et al, 2023 ) in developing the items for our measure. In brief, these items were developed to represent a core process in writing synthesis texts and communicating an integrated understanding based on multiple source reading, with different aspects of this process, such as dealing with inconsistencies, explaining similarities and differences between perspectives, creating overview and comprehensiveness, and producing a new, original text, presumably captured by the items.…”