Working memory and word-problem solving trainings, which combination is more effective?

A study conducted by Lynn and Douglas Fuchs and colleagues looked at the effectiveness of interventions that combine training on working memory (WM) and word-problem solving (WPS). The four interventions were as follows:

• Intervention 1 – general training on WM
• Intervention 2 – training on WPS without WM training
• Intervention 3 – training on WPS with math-specific WM training
• Control group – no intervention