Ann: Central Tanami Update,NST-TAM.AX, page-23

What is a Heads of Agreement?

A Heads of Agreement, properly drafted, is a non-binding document which sets out the key terms of a proposed agreement between parties.

It is commonly used as part of the process of negotiating commercial transactions for example, the purchase of a business.

The idea is that the parties sign the Heads of Agreement at the pre-contractual stage of negotiations, with the intention of the parties continuing negotiations with the involvement of lawyers and accountants, and ultimately entering into a binding contract.

In general, an Heads of Agreement can be effective to provide:

a framework for the parties to negotiate a final contract;
a record of key terms agreed on to date;
evidence of a party's commitment for the benefit of third parties such as banks or potential investors;
a mechanism for dealing with pre-contractual issues such as exclusivity, confidentiality, due diligence and intellectual property;
a degree of confidence that a deal is probable before the parties incur further expense.

Is a Heads of Agreement legally binding?

Some people immediately assume that a Heads of Agreement is legally binding, while others assume it is not.

The reality is that a Heads of Agreement could be either binding or not. However, generally the intention is that the Heads of Agreement is not binding in relation to the "key terms of a proposed agreement between parties", but is binding in relation to such matters as  "exclusivity, confidentiality, due diligence and intellectual property".

Taken from http://www.turnbullhill.com.au/arti...-agreement-and-are-they-legally-binding-.html