# Glossary:A-Factor

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- A-Factor (absolute factor; AF)
- number associated with every element in a collection.
**A-Factor**determines how much intervals increase in the learning process. The higher the**A-Factor**, the faster the intervals increase. You can see**A-Factors**in the**Element data**window. For items,**A-Factors**reflect item difficulty. For topics,**A-Factors**modulate topic priority (by affecting the frequency of exposition). The higher the**A-Factor**the easier the item. The most difficult items have**A-Factors**equal to 1.2. For items,**A-Factor**is defined as the quotient of the second optimum interval and the first optimum interval used in repetitions (read more: SuperMemo Algorithm SM-15). For topics and tasks,**A-Factor**is interpreted as the number by which the current interval should be multiplied to get the value of the next interval (as it was the case with E-Factors in early versions of**SuperMemo**).