“…This particular scheme emerged in the 1980s and 1990s. The taxonomy of problem types presented in Table 1 has influenced teacher professional-development programs in mathematics (see, e.g., Carpenter et al, 1996Carpenter et al, , 1999Fennema et al, 1996;Schoen et al, 2018Schoen et al, , 2020, further research on word-problem difficulty (see, e.g., Garcia et al, 2006;Olkun & Toluk, 2002;Stigler et al, 1986), and policy (see, e.g., NGA & CCSSO, 2010). Although it uses different terminology for the Join, Separate, and Part-Part-Whole semantic categories, the taxonomy of additive word problems in the CCSSM (see Table 2) is very similar to that in Table 1.…”