The Cuban economy is fairly typical of the small tropical, primary producing, import-oriented economies which comprise the majority of the world’s under-developed nations. In terms of national income per head the Cuban economy before the revolution was stagnant rather than poor. Eric Williams [24] states that the national per capita income in 1958 was $500.00 ranking third in Latin America and well above average for third world countries.

In order to help students achieve the goal of conceptual understanding teachers must not only know and appreciate the nature and value of such understanding but must know how concepts are learned. One point on which many studies of concept development to date seem to agree is that one person cannot give concepts to another at any level higher than that of simple recognition. Teachers can identify a concept for students and expect them to know it on the cognitive level of recall.