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Lertap, the Laboratory of Educational Research Test Analysis Package, is a system for item, test, and survey analysis. It's an Excel "app" running on Windows and Macintosh computers.

This site supports Lertap users by providing access to a variety of resources. You'll find introductory material, meant to show off what Lertap can do; sample data sets for use with classes; lots of documentation; and access to software for downloading.

Can't find what you want on this site? Just send us an email message, and let us know what you're looking for (puedes escribirnos en español, si quieres).

Developments of Special Note

April 2014: a new website has been developed to replace this one. Link to it here.

July 2013: New document added: "Lertap and Excel Tips, Suggestions, Tricks". Branch to it here.

May 2013: The mastery test analysis capabilities of the Excel 2010 / 2013 version have been substantially enhanced. Details may be seen in the updates summary.

April 2013: The Excel 2010 / 2013 version has been updated to 5.10.2. The main feature of 10.5.2: a "Mini" version is now the default. This is similar to the former Student version in that it will process only the first 50 records of a dataset. However, it may readily be upgraded to the "Full" version (a perpetual license), or to a limited-term "Standard" version. More in the updates summary; specific comments about upgrading are found in this document. Download this new version with a click here. Excel 2013 users: check out initial time trials in this document.

March 2013: New book by Haladyna & Rodriguez ("Developing and Validating Test Items", Routledge, 2013) refers to Lertap as "... a very versatile item analysis program with many features, including DIF analyses."

July 2012: The 10th edition of Lertap 5 is ready. The Lertap page within the ASC site has details, and includes a link to download this new version, 5.10.1, for a free 30-day test drive. (This version requires Excel 2010, a Windows version of Excel.)

May 2012: The version for use with Excel 2011 (Macintosh) is ready. Write to if interested.

May 2012: A new intro to Lertap 5 is available, a small set of PowerPoint slides which will open in your browser. This may be the quickest way yet to get an overview of what Lertap 5 can do.

January 2012: Click here to read about the new version of Iteman and how it compares to Lertap. And then, for more about these two programs, and the way they summarize item performance, why not click me?

October 2011: both the Excel 2007 and Excel 2010 versions have been updated with a new routine, "ChartChanger2", which significantly enhances Lertap's ability to display and print quintile plots. Fix yourself up with wall-to-wall plots of item performance graphs. Quickly get an idea of where the weak items are, pictorially. Fun. Useful. See it: click here to read about ChartChanger2, and then here to see how it may be used to make printing quintile charts easier.

Instructors and Students

Version 5.10.2 (or better) for Excel 2010 and Excel 2013 is freely available. Students may download it to their own computers, or it can be set up in a computer lab.

Download this version with a click here. It'll come through as Lertap 'Mini' -- a fully functional version, limited to processing the first 50 records of a dataset. 'Mini' can be upgraded to 'Full' or to 'Standard' when / if desired. For more information, check out this site:

Popular Documentation Links

Of course, every resource on our website is popular -- you'd expect no less, no doubt.

However there are two documents which continue to draw the largest crowds, and by far.

One is a paper on "visual item analysis", suggesting supplementing tables of item statistics with eye-catching visuals called "quintile plots" -- click here to link to it, a pdf document about 400 KB in size.

The other is a nearly-exact copy of a 2007 journal article regarding the use of cut scores, as in licensing and certification testing. It's a pdf document, available by clicking here. (This document is fairly technical in nature.)

Coming in third place is a newer document, another compelling read (naturally), having to do with using Lertap to look for response differences among groups of test takers. For example, users can ask Lertap to create statistics and response charts which will compare item answers, and test scores, by region or gender. Get it, another pdf document, here.


To see Lertap being put through a variety of hoops, kick back and take in one of our video "stories". Try 'em: let yourself be dazzled and entertained. (Note that some of the videos are undoubtedly too long, and some perhaps move along at a turtle-like pace, but give them a burl, using fast forward as wanted.)