legato playing

[PaulNaud]

Some teachers think that it is accomplished most perfectly and more easily by means of the pressure touch. But what "pressure" means? The weight is pushed from one finger to another?
Some other teachers think that deep legato practicing is extremely useful for strengthening weak nervous processes. After-pressure of each finger is recommended. But this pressure touch is not advocated by everybody.
And what about "legatissimo"? It could really mean the holding of one note until two or more are played!
Depending on the type of technical formation, there is at any given moment a prevalence of greater or lesser activity in this or that part  of the playing apparatus.