Firms evaluate programmes periodically to investigate how a programme is progressing and why - and at its end, to determine if it has met its goals. Evaluation guidelines need to be set early. There are three types of evaluations: impact, which determines how well a programme did over a set time or at the end of the programme; process, which assesses how efficiently a programme was implemented compared with its stated objectives; and market effect, which estimates how a programme will affect the market in the future. Standards and product labelling are used widely in developing countries - 21 of 37 reviewed countries have them. Mandatory audits are used less frequently; only 13 countries have introduced them (UNIDO 2011).