The first part of this research is about the use of learning strategies that are specifically taught to students e.g. the method of loci, in order to perform verbal recall tasks and examining the cognitive styles exhibited by the students in completing these verbal learning tasks. The second part of this research focuses upon the workings out or external representations that students use to assist them in solving a variety of cognitive problems including: analytic reasoning,verbal reasoning, spatial, and mathematical word problems; and the cognitive styles exhibited by these students in solving different problems. Four experiments were conducted using original wordlist booklets. The students ranged in age from ten to fourteen years old. Two experiments were conducted using a variety of cognitive problems and the students were postgraduates and undergraduates,respectively. The results indicated that either being taught or learning the strategies from written instruction does not greatly influence verbal learning. Also,most students used some type of external representation in solving problems and age and Cognitive Style influenced the type of representation used.