The day was conducted under Chatham House rules, where participants are encouraged to speak freely, on the understanding that they are not directly quoted.
Speakers included senior consultants and contractors.
Several delegates proposed an amnesty for businesses which may have engaged in corrupt practice in the past, but no longer do.
Other speakers proposed walking away from jobs where it was expected that bribes may be asked for, or to avoid working in countries where corruption is rife.
One leading engineer described how his company had stopped working in many developing nations because of corruption. He said firms take on work in these countries with the best of intentions, but are forced into paying bribes to get projects moving.
Anti-Corruption Forum members are: the ICE, ACE, IStructE, British Expertise, Chartered Institute of Building, IMechE, Engineers Against Poverty and Transparency International.