The Principles of Good Impact Reporting and its accompanying guide, Principles into Practice, describes the tools charities need to measure and report their impact.
The publications were developed by the three organisations after consultation with charities and social enterprises.
"As organisations face greater demands from donors, funders and service users to demonstrate their impact, clear, effective reporting is more important than ever," the CFG said in a statement to accompany the launch.
"By using the principles, charities and social enterprises can have a strong influence on how they are perceived and can help to shift the prevailing focus away from concerns about administration costs or chief executives’ salaries, and towards what really matters: the difference they make in people’s lives."
The principles give organisations of all sizes a clear set of guidance on how they should communicate their impact, and what they should communicate.
The guide says that to be effective charities must clearly communicate why they exist and what they want to achieve, what activities they are carrying out to meet those goals and what results they have had. They must also show effective evidence to support their conclusions, and what lessons they have learned from their work.
It also says that measures must be clear, accessible and transparent, accountable to stakeholders, verifiable by anyone interested and detailed enough to reflect the size and complexity of the organisation and its activities.