Spanish term (edited): lineas formativas

Vygotsky:

<<In the process of development the child not only masters the items of cultural experience but the habits and forms of cultural behaviour, the cultural methods of reasoning. We must, therefore, distinguish the main LINES IN THE DEVELOPMENT of the child’s behaviour. First, there is the line of natural development of behaviour which is closely bound up with the processes of general organic growth and the maturation of the child. Second, there is the line of cultural improvement of the psychological functions, the working out of new methods of reasoning, the mastering of the cultural methods of behaviour.

Thus, of two children of different ages the elder can remember better and more than the younger. This is true for two entirely different reasons. The processes of memorizing of the older child have undergone, during his additional period of growth, a certain evolution — they have attained a higher level — but only by means of psychological analysis may we reveal whether that evolution proceeded on the first or on the second line.

Maybe the child remembers better because his nervous and mental constitutions which underlie the processes of memory were developed and perfected, because the organic base of these processes was developed; in short, because of the mneme or mnemic functions of the child. However, the development might follow quite a different path. The organic base of memory, mneme, might remain substantially unaltered during the period of growth, but the methods of memorizing might have changed. The child might have learned how to use his memory in a more efficient way. He could have mastered the mnemotechnical methods of memorizing; in particular, he may have developed the method of memorizing by means of signs.

In fact both LINES OF DEVELOPMENT can always be revealed, for the older child not only remembers more facts than the younger one, but he remembers them in a different way. In the process of development we can trace that qualitative change in the form of behaviour and the transformation of some such forms into others.>>

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Note added at 1 hr 57 mins (2004-10-05 05:58:58 GMT)
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The program is organized along two lines of development...

actually, this is a wild guess!....take it with a few grains of salt, but it's my best guess so far!
Good luck!!

another example:the formative years:los años formativos.
Hope it can help!!!!Best of luck!