A1.10 Constraints and dependencies will affect which options are feasible. They should be identified and understood at the earliest possible stage and taken into account when developing a long-list. Constraints might include legality, ethics, social acceptability, practicality and coherence with wider public policies and strategy. Dependencies are factors that an option relies on to be successful. They are external and outside of direct control, but the successful delivery of objectives depends on them (for example, infrastructure).