Why Customer Involvement in Testing Is Difficult

People adopting the customer role often have very limited available time and may not be able to work full time with the development team — they may feel providing requirements was enough and be reluctant to get involved in testing

Explanation

Relying on the customer for acceptance test development is sometimes a major difficulty because people adopting the customer role have very limited available time and may not be able to work full-time with the development team. The customer may feel that providing the requirements was enough of a contribution and so may be reluctant to get involved in the testing process.