API measures student level of academic procrastination. It includes a 19-item self-report using 1 (false) to 5 (true) scale. 

Sample item - "I delay starting things until the last minute"

There is a Turkish version of the API which has 16 items. 

Grinnell College

Aitken Procrastination Inventory - API

Procrasstination Assessment Scale-Students - PASS

Methods of measuring academic procrastination

Balkis, M. & Erdinç, D. (2017). Gender differences in the relationship between academic procrastination, satifaction with academic life and academic performance. 15. 105-125. 10.14204/ejrep.41.16042. 

Gender differences in the relationship between academic procrastination, satisfaction with academic life and academic performance

This assessment measures academic procrastination consisting of 2 sections and 44 different items. The first section contains 18 items measuring the incidence of procrastination in activities pertaining to the following six academic areas:
- completing a writing assignment
- studying for an exam
- keeping up with weekly reading assignments
- performing administrative tasks (e.g. filling out forms, registering for classes)
- attending meetings
- performing academic tasks in general.

For each area, the first item measures the frequency of procrastination for the task. The second item measures the degree to which academic procrastination causes a problem, and the third item the willingness of students to decrease their procrastination behavior. All were rated on a scale of 1 (never) to 5 (always).

The second section of the PASS assesses how much each of 26 separate reasons reflects why respondents procrastinated in completing a writing assignment. 


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