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Progress in International Reading Literary Study 2011 (IGLU 2011)

Research Question

PIRLS 2011 is a by the IEA (International Association for the Evaluation of Educational Achievement) initiated student assessment study which with the survey of 2011 after 2001 and 2006 was carried out for the third time.

With PIRLS the reading comprehension of students at the end of fourth grade was internationally comparative examined with the objective to obtain reliable information about the knowledge and skill level of the students in the participating countries. In addition to reading literacy, the areas of reading intention, of reading comprehension as well as reading habits and attitudes towards reading were covered. Furthermore, information on the institutional and social framework conditions that influence the supply and use of scholastic learning opportunities was gathered.

Test Language


Test Period


Test Area and International Link

International survey and national supplementary study with all German Länder

Target Persons

Primary school students in grade 4

Context Persons

Parents and German teachers of the selected student and the principals of the selected schools

Population / Sample

The sampling in PIRLS is based on a two-stage stratified cluster design. The first sampling step consists of a random sample of schools out of all schools of the national effectively reached target population; the second step includes the determination of one or more classes in the selected schools.

Sample Size

n= circa 4,000 students at the end of fourth grade

Survey Procedure and Instruments

Competence tests in German - reading comprehension and questionnaires for students, teachers, school principals and parents

Link to the Detailed Description of the Study (only available in German)

Persistent Identifier

DOI: 10.5159/IQB_IGLU_2011_v1

Data Accessible via Research Data Centre

Link to the Study Documentation at the FDZ at the IQB:

Information about the using conditions can be found here:

Documentation of Variables

PDF-file for download can be found here:


Monika Lacher
FDZ Secretary
Phone: +49 30 / 20 93 - 465 52
Email: fdz[at]

Selection of Publications using the Data

The IGLU 2011 publications list can be found here as PDF-file for download: (in German)

Related Data

Progress in International Reading Literacy Study (PIRLS 2001)
Progress in International Reading Literacy Study (PIRLS 2006)
Trends in International Mathematics and Science Study 2011 (TIMSS 2011)
IQB National Assessment Study in Primary Schools 2011 (IQB-LV 2011)

In 2011, PIRLS coincided for the first time with TIMSS (Trends in International Mathematics and Science Study). In Germany, both studies were performed with a common sample so that the same fourth grade students were assessed in reading, mathematics and science.

Research Area(s)