English to Russian Bus/Financial Economics

Подскажите разницу в переводе этих понятий, пожалуйста. Особенно во второй части отрывка, где
Business efficiency и Business effectiveness :

Fundamentally, IT creates value by improving operational efficiency and/or effectiveness, but defining what this actually means isn't straightforward. Greater efficiency mans reducing input cost—the effort or time required to achieve a given level of output. Greater effectiveness means achieving better-quality or higher-value output for the same level of input. A further guideline for defining useful metrics is to divide them into three distinct categories:
• IT efficiency → Direct total cost of ownership (TCO) savings in use of IT resources
• Business efficiency → Productivity savings in terms of business users' time to perform both transaction and decision-making work
• Business effectiveness -> Improved business performance from faster and more informed decision-making