Bookmark method (item-centered): Items in a test (or a subset of them) are ordered by difficulty (e.g., Item Response Theory b-parameters or Classical Test Theory p-values) from easiest to hardest. SMEs place a "bookmark" in the sequence where they think that the location of the cutscore should be (“As the test gets harder, where would a participant on the boundary of the performance level not be able to get any more questions correct?”) This method can be used with virtually any question type (e.g., multiple-choice, multiple-response, matching, etc.).

Коэффициент интеллекта — Википедия
http://ru.wikipedia.org/wiki/%D0%9A%D0%BE%D1%8D%D1%84%D1%84%...
Каждый тест состоит из множества различных заданий нарастающей сложности. Среди них тестовые задания на логическое и пространственное ...

Предлагаю такой перевод на основании следующей информации:

Bookmark method was based on using the Item Response Theory (IRT) and mapping the items. Items are ordered according to the place they occupy in the scale. Their place in the scale is determined according to item difficulty (p). The ordering is from the easiest item to the most difficult item. The reason for calling the method as bookmark is that experts state their decisions with markings in guides where the items are ordered from the easiest to the most difficult. The guides are called ordered item booklets.

This level of ability is the bookmark difficulty location (BDL). Even though the measurement is called a difficulty location, it is actually a measurement of ability (or rather, it is a measure of ability in which ability and difficulty are measured in the same scale).

http://files.eric.ed.gov/fulltext/EJ1027679.pdf

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Note added at 5 hrs (2014-12-05 21:25:37 GMT)
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Это, конечно, перевод смысловой. Если требуется отразить дословно название на английском, то надо думать дальше. Может быть, скомбинировать с вариантом Эрики: метод маркировки/ закладки по уровню сложности.