Spacing schedules (in number of repetitions)
| Relative spacing | |||
|---|---|---|---|
| Absolute spacing | Expanding schedule The intervals between tests progressively lengthen | Equal schedule The intervals between tests are constant | Contracting schedule The intervals between tests progressively shorten |
| Short (15) | 1–5–9 | 5–5–5 | 9–5–1 |
| Medium (30) | 5–10–15 | 10–10–10 | 15–10–5 |
| Long (90) | 15–30–45 | 30–30–30 | 45–30–15 |
| Relative spacing | |||
|---|---|---|---|
| Absolute spacing | Expanding schedule | Equal schedule | Contracting schedule |
| Short (15) | 1–5–9 | 5–5–5 | 9–5–1 |
| Medium (30) | 5–10–15 | 10–10–10 | 15–10–5 |
| Long (90) | 15–30–45 | 30–30–30 | 45–30–15 |
Source: adapted from Khalil and Elkhider (2016)
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