Elicitation and Gathering of Requirements - Requirements Engineering and Management for Software Development Projects - page 53

3.12 Final Words
Elicitation and gathering is a critical activity in the requirements management.
When a project fails due to inefficient engineering and management of require-
ments, in most cases, the failure would be because of poor requirements elicitation
and gathering. In most cases, we carry out elicitation and gathering for the project
(or iteration in the case of agile projects) in multiple installments. But the first
installment should see that 70-80 % of the requirements being collected. The
remaining information may be collected in one or two more installments. If we
take more installments for elicitation and gathering, we may often receive con-
tradictory and duplicate requirements. So it is necessary that all efforts must be put
in to ensure that this phase is carried out diligently.