Firstly, if u know sth abt Management, u'll see one of the managerial function is that balancing effectiveness and efficiency. But i don't understand much the difference between the two terms.
Secondly, in E., there are a lot of words that have the similiar meanings or the same meanings. Please show me the way to use it, or a book that teaches me do that? (e.g: three verbs: to pledge, to commit, and to undertake).
Thanks. híc m40`