Table:
|  | 30 June 2019 | 30 June 2018 |
| --- | --- | --- |
|  | $'000 | $'000 |
| Total segment profit before tax | 62,583 | 61,449 |
| Employee benefits expense (non-facility staff) | (23,036) | (20,752) |
| Interest revenue | 8,220 | 5,778 |
| Distributions from investments | 1,344 | 3,191 |
| Other income | 3,034 | 284 |
| Finance costs | (45,612) | (25,452) |
| Head office depreciation | (2,079) | (1,909) |
| Overheads and other expenses | (20,527) | (11,698) |
| Profit/(loss) before tax | (16,073) | 10,891 |
Paragraphs:
1 Segment performance (continued)
(c) Other segment information
(i) Profit/(loss) before tax
Management assesses the performance of the operating segments based on a measure of EBITDA. Interest income and expenditure are not allocated to segments, as this type of activity is driven by the central treasury function, which manages the cash position of the Group. On adoption of AASB 16 from 1 July 2018, associated lease interest is allocated to the respective segments as a finance charge.
Question:
How do NextDC Management assess performance of the operating segments?
Answer: based on a measure of EBITDA.