Nayan has just passed his Senior Secondary Examination from CBSE affiliated school. He wanted to start his own business but was undecided about the nature of the business to be started. One day, during the morning walk, his grandfather fell down in the park and was injured. He observed that his grandfather often forgot to take his medicines. He thought that the same problem may be faced by other old people. He thought to develop a walking stick for old people that could be fitted with some electric devices connected to the mobile phones of the members of their families which could indicate the location of the old people when they go outside their homes. He also thought to fit a timer in the stick that could remind them about the time of taking their medicines. Identify and state the meaning of the concept described in the above para that helped Nayan in structuring his idea of solving the problem.