Development of nations

Here is a question that has come up from time to time.
What is meant by a 'developed' country? In what aspects of civilization is 'development' defined? By what metrics is it measured? What is the standard to be met? On what scale?
If we have a clear understanding of development, we might have a basis for judgments of
what countries are 'developing' and 'underdeveloped'. Are there any 'undeveloped' countries left? Have any countries become 'overdeveloped'?
If we understood what 'development' entails, we'd have a solid basis for discussing what any particular nation requires in order to develop further.
Assuming that's a desirable goal.
And, if so, what direction such development can/should/will take.
What is meant by a 'developed' country? In what aspects of civilization is 'development' defined? By what metrics is it measured? What is the standard to be met? On what scale?
If we have a clear understanding of development, we might have a basis for judgments of
what countries are 'developing' and 'underdeveloped'. Are there any 'undeveloped' countries left? Have any countries become 'overdeveloped'?
If we understood what 'development' entails, we'd have a solid basis for discussing what any particular nation requires in order to develop further.
Assuming that's a desirable goal.
And, if so, what direction such development can/should/will take.