Fig. 2From: Exploring the ‘solution space’ is key: SOLUTIONS recommends an early-stage assessment of options to protect and restore water quality against chemical pollutionThe strategy for exploring the ‘solution space’, based on the conceptual framework (Fig. 1, [19]). The different codes (C1, C2, …etc.) visualize that there are widely different options in the ‘solution space’, ranging from operational options for local application (e.g., to swiftly solve a local water quality problem), up till tactical and strategic options for (inter)national water governance. The diversity of codes is explained in the text, and some examples are summarized in Additional file 1Back to article page