To change a major triad into a minor triad you:
lower the third one half step
To change a major triad into a diminished triad you:
lower the third and fifth one half step
To change a major triad into an augmented triad you:
raise the fifth one half step
To change a minor triad into a major triad you:
raise the third one half step
To change a minor triad into a diminished triad you:
lower the fifth one half step
To change a minor triad into an augmented triad you:
raise the third and the fifth one half step
To change a diminished triad into a minor triad you:
raise the fifth one half step
To change a diminished triad into a major triad you:
raise the third and the fifth one half step
To change an augmented triad into a major triad you:
lower the fifth one half step