Answer:
We can define development as the improvement of the social conditions and standards of living of a society according to a set of ideas and goals previously established.
Step-by-step explanation:
If we understand development as economic development, then we can see why the pace of the development of society differs from society to society.
Economic development depends mostly on two variables: the advance of techology, and the amount of saving and investment.
Some societies save and invest more than others, either because they have more resources to save from, or because their propensity to save is higher.
As for technology, in some societies the speed of technological change is faster than in others, either because they produce more technological advancement, or because they make use of new technology more quickly.
In conclusion, the pace of development differs from society to society because societies differ in the level of saving and investment they generate, and in the speed of production or adoption of new technologies.