Talking about personal growth, an existent product, a non-existent product (to be made).
In which case should I use one instead of the other?
edit: for example, for personal growth which one is better?
from dictionary:
improvement:
noun
- an act of improving or the state of being improved.
- a change or addition by which a thing is improved.
- a person or thing that represents an advance on another in excellence or achievement: The new landlord is a great improvement over his greedy predecessor.
- a bringing into a more valuable or desirable condition, as of land or real property; betterment.
- something done or added to real property that increases its value.
- profitable use, as of a period of time.
development:
noun
the act or process of developing; growth; progress: child development; economic development.
a significant consequence or event: recent developments in the field of science.
a developed or advanced state or form: Drama reached its highest development in the plays of Shakespeare.
Music . the part of a movement or composition in which a theme or themes are developed, or unfolded and elaborated, by various technical means, so as to reveal their inherent possibilities.
a large group of private houses or of apartment houses, often of similar design, constructed as a unified community, especially by a real-estate developer or government organization.
Chess . the act or process of developing chess pieces.