Making predictions about the year ahead, Anne Sharp said the number of calls received by the employment information service’s helpline on the subject showed it continues to confuse employees.
"If used responsibly by employers, zero-hours contracts can offer valuable flexibility for both them and employees,” Sharp said.
"But we know from calls to the Acas helpline that there's a lot of uncertainty on both sides around these contracts which leads to confusion.
"Employee callers in particular identified strong concerns about their terms being changed at short notice.
"That's why we welcome the Government's announcement of a consultation on zero-hours contracts, which will look at improving guidance for both employers and employees on their use."
The Government launched a 12-week consultation on problems surrounding the use of zero-hours contracts in December.
This month, a private members bill that seeks to prohibit the use of zero-hours employment contracts will have its second reading in the House of Commons.
Sharp also suggested economic recovery could prompt fresh action from employees to demand greater salaries.
"While the economy is showing signs of recovery, pay may well loom large on the employment relations agenda in 2014 as workers look to catch up for past pay restraint,” she said.
