The Code of Good Impact Practice has been developed by a group of representatives from 17 sector bodies and is described by NPC as "the first-ever set of guidelines on what good impact practice looks like in the not-for-profit sector".
It makes a list of recommendations for those involved in measuring impact, including being honest, using "proportionate and appropriate" methods, being willing to change, and sharing methodology and learning.
Tris Lumley, head of development at NPC, said the sector had now reached a point where most charities and social enterprises were aware of the importance of measuring their impact.
"However, they still struggle to know what good practice looks like and what’s right for them, with lots of different definitions and often conflicting guidance on what they should do," he said. "We want the Code of Good Impact Practice to be a user-friendly tool that will be widely used. We encourage people to respond to this consultation to make sure it works for them."
Third sector organisations will be asked to give their views on the code through a survey run by the National Council for Voluntary Organisations. Catharine Pusey, head of consultancy at the NCVO, said the aim was for the code to be the "guiding light" for all charities interested in impact.
"The principles in the code can be applied by charities whatever their area of work, from adoption to zoology," she said. "We are eager for further feedback so that the final guide is of the greatest use and value for all."