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Welcome to CBTAonline - Tools for Behavior Analysis




It is with great sadness that we disclose the untimely passing of Nathan Kruser, our dear colleague and expert software programmer. Nathan was committed to helping people through the tools that we created. We are suspending sales and support of our ABC products until further notice. This web site and the analysis tools will remain active. Nathan is survived by his wife, his two year old son, and five year old daughter. We are all heartbroken over the loss of such a kind and gentle soul.

October 3, 2014

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NOTE: ABC Data Pro does not yet support iOS 8. We are working to resolve the issue

The ‘Simple as ABC’ Suite of Observation Tools. Software to assist professionals and students in Applied Behavior Analysis (ABA), special education, school psychology, and clinical psychology, as well as researchers conducting observational studies.

  • Designed by: Raymond G. Romanczyk, BCBA-D, Jennifer M. Gillis, BCBA-D, and Emily H. Callahan, BCBA-D. Built by: Nate Kruser
  • Please see Products for information about our Apps for the iPhone™, iTouch™, and iPad™ available now on the iTunes Store!
  • Please leave your contact info under Contact Us so that we may advise you of updates and the release of future tools for behavior analysis.
    Your contact information will not be shared with any group, sales office, or organization. It will only be used to advise you of product availability and updates by CBTAonline.

Our suite of apps provide free:

Web-based Analyses.
Video Pro, like ABC Logbook and Data Pro, each use their own web-based analysis tools. These apps include free access to these sophisticated analyses.
Inter-observer reliability.
Easily compare observations and select parameters to calculate both event and interval based IOA. In interval mode, Cohen's Kappa is calculated in addition to the traditional Agreements divided by Agreements and Disagreements. Further, errors of omission and errors of comission are highlighted in a display of the data stream to enhance error resolution and speed training of observers in achieving reliability.
Conditional probability.
The literature presents several different arguments about calculating conditional probabilities. Our analysis tool therefore calculates conditional probability, proportion probability, and co-occurnece probability.
Session Analysis Metrics.
Quantitative presentation of count, duration, interval, and proportion. User friendly tabular format.

Video Pro for iPad and
Video Pro Lite for iPad now available!


This is the most advanced of our apps. It is an elegant app to analyze video as well as perform in vivo observations. Please download the FREE Video Pro Lite before purchasing Video Pro. Video Pro Lite is fully functional to allow you to assess it's capabilities and our free web analysis tools.

Please read the information here carefully to determine if our apps are applicable to your needs BEFORE purchasing.

Comparison of our four products, ABC Data, ABC Data Pro, ABC Logbook, and VideoPro for iPad

Features ABC Data ABC Data Pro ABC Logbook VideoPro for iPad
Multiple recording modes ✓ ✓
In app help videos ✓
Ad Hoc recording ✓
# of different items (behaviors or events) that can be recorded in one session 3 9 (27 in FBA mode) over 100 per individual 27
Record individuals ✓ ✓ ✓ ✓
Organize individuals within groups ✓ ✓ ✓
Partial Interval recording ✓ ✓
Whole Interval recording ✓ ✓
Momentary time sampling mode ✓
Precise time logging of each event ✓ ✓ ✓
Set audio interval alerts ✓ ✓ ✓
Set interval length timer ✓ ✓
Set session length timer ✓
Pause timer ✓ ✓ ✓
Each button configurable as count or duration ✓ ✓
User defined button labels ✓ ✓ ✓ ✓
User defined button colors ✓
Save button labels ✓ ✓ ✓ ✓
Save multiple sets of button labels/configurations ✓ ✓ ✓
Duplicate individual/group configurations for re-use ✓ ✓ ✓
Share configurations with another user via Email ✓ ✓ ✓
Multiple user(s) "Profiles", each with data collection configurations composed of groups, individuals, and behaviors ✓
Identify observer, setting, context for observations, etc in emailed data ✓ ✓ ✓ ✓
Add notes about session ✓ ✓ ✓ ✓
Add notes for each occurrence of behavior ✓ ✓
Record group event ✓ ✓
Delete mistakes in real time ✓ ✓ ✓
Preserve log of deleted items ✓ ✓
Review on device stored recordings ✓ ✓
Store on device multiple individual's/group's recordings ✓ ✓ ✓
Full data export - chronological order ✓ ✓ ✓
Full data export – chronological order for all group's events ✓
Select date and time range for data export for group/individual ✓
Data output formatted for Excel™ (copy, paste, auto setup) ✓ ✓ ✓ ✓
Export data via email ✓ ✓ ✓ ✓
Export CSV file Excel™ can open ✓
Count analysis matrix ✓ ✓ ✓ ✓
Proportion, partial interval, whole interval, and duration analyses ✓ post hoc ✓
FBA analyses ✓ ✓ ✓
Conditional probability analyses ✓ ✓ ✓
Conditional probability co-occurrence analysis ✓
Event based IOA ✓
Interval based IOA ✓ post hoc ✓
Calculates Cohen's kappa ✓ ✓ ✓
Color code IOA disagreements ✓ ✓ ✓