This chapter explains the background and gives a (p)review on the active control of properties of concrete, based on the application of external signals to trigger an intended response. Current practices in concrete industry that could be considered as active control have been listed. More advanced active control mechanisms as studied in other fields are briefly summarized. A specific focus is further given on potential methods for active rheology control. Based on the concepts developed in other fields, substantial progress could be made in order to achieve active control of fresh and hardened concrete properties. However, several challenges remain, like the stability and functioning of the responsive material in a cementitious environment, the applicability of the control signal in a cementitious material, and the economy, logistics and safety of a control system on a construction site or in precast industry. Finding solutions to these challenges will lead to marvellous opportunities.