John approaches problems systematically, considering various solutions and the consequences of each before he decides on the implementation of any one solution. john is probably at which level of cognitive development?

John is at the level of formal operations in terms of cognitive development. It is because this level, the formal operational, it is where a person has develop skills in terms of logical thought, reasoning, planning and in terms of having to have abstract concepts. It could be seen from his behavior as he demonstrated reasoning and logical though in approaching problems.