I think that the current KTouch trainer for Italian is suboptimal for the following reasons:

• Too many letters learned at once in a lesson (up to eight per lesson!)
• The first two lessons make the user use one single hand at the time
• Too many lessons are mane of combination of characters instead of meaningful words (suboptimal for learning)
• Lessons where symbols are taught include too few symbols respect the total number of typed characters

The proposed lesson fix the previous problems, in particular:

• Only the first three lessons includes combination of characters instead of meaningful words
• All lessons make the user use both hands
• The lessons where symbols are thaugh include a symbol after each word
• The new symbols represent the 50% of all the symbols in the lesson
• Added new lessons for numbers
• The lessons for learning symbols and numbers include words of up to seven characters to minimize the time spent on typing letters instead of symbols/numbers

The only drawback is that symbols are not learned in common phrases as the current italian lesson does,
but this provides the advantage of a more focused learning on the symbols with less time spent in typing text.