C&I refers to consequences and implications. This method is described by de Bono as a means of looking at the consequences of an approach/idea in terms of specific temporal effects. In the original, the method is called c&s (consequences and sequel) and is sometimes also referred to in German-speaking countries as the ZUF (Zukünftige Folgen) technique.
An idea or issue is put to the test here in its immediate, short-term (one to five years), medium-term (five to 20 years), and long-term (longer than 20 years) consequences. This helps to address the consequences of a particular approach.
The method is particularly helpful when several similar ideas have been developed and a decision is now required as to which option is the best or most suitable to pursue or implement.