The new work arrangement, which was implemented on July 1, has benefited nearly 700 employees. The total number of working hours will be reduced to 40 hours per week.

The council said the arrangement aimed at improving efficiency, it also hoped to retain the talents.

CIC said under the new measure, the public services of the Council such as teaching hours, worker registration and trade tests will not be affected.

CIC is a statutory body with members from government officials, professionals, academics, contractors, workers and independent persons.

Eddie Lam Kin-wing, president of Hong Kong Construction Association, said CIC does not have front-line workers and therefore it is nothing wrong with them trying out the new working arrangement.

"However, workers have to work 6 days after all and even if it (four-day work) didn't affect our schedule, it will affect the income of workers."

He also said if only the workers worked six days but office colleagues did not, many works that require cooperation could not get done. "If the working hours were shortened with the salary staying unchanged, whether the cost would be again passed on to customers?"