When a Select Committee launches a new inquiry they often request written evidence from interested parties.
A call for evidence is often published at the same time as, or shortly after, the inquiry is announced.
The Committee will use this written evidence to help shape their inquiry and it may influence the choice of witnesses the Committee calls to appear before them during the oral evidence stage. In recent years select committees have increasingly used web forums to help gather material for inquiries.
Guidance on how to submit written evidence to House of Commons and House of Lords Select Committee inquiries is available here: