The data is sourced from the IDI. Business information comes from the business register, this includes the industry and the region that the business operates in. The number of employees is determined from IRD tax records. An employee of a business in a given tax year is defined as someone who received wage or salary income from that business in that tax year.
Businesses are considered to be engaged with ITOs if they have had an employee start or successfully finish an ITO qualification in the previous five years.