guideline

noun
B2+
1
B2+
a set of rules or instructions that are given by an official organization telling you how to do something, especially something difficult
رهنمود, دستورالعمل, آیین‌نامه
2
B2+
something that can be used to help you make a decision or form an opinion
رهنمود, دستورالعمل, خط‌مشی
The figures are a useful guideline when buying a house.