Centre for Decision Research and Experimental Economics


Lioness-LogoLIONESS: Live Online Experimental Server Software

LIONESS is an open-source software platform for online behavioural experiments including live interaction. LIONESS only requires an active web server to connect the participants of an experiment, who interact through their web browsers. 

The basic logic of LIONESS was developed by Lucas Molleman, Antonio A. Aréchar and Simon Gächter at the Centre for Decision Research and Experimental Economics (CeDEx; University of Nottingham) with support from the European Research Council (ERC-AdG 295707).

Methodological paper: Conducting interactive experiments online

The paper Conducting interactive experiments online (Aréchar, Gächter and Molleman 2017 Experimental Economics) provides a methodological discussion of running interactive web-based experiments. The data for this paper were obtained with LIONESS, using this experimental program (zip). 

Prospective users without access to a web server (or those with no experience with using a web server) can get LIONESS up and running in just a few minutes time. For instructions, see this brief manual.

LIONESS Lab: readily create your own experimental tasks

In collaboration with Dr Marcus Giamattei from the University of Passau, Germany, we are currently developing LIONESS Lab. This will allow researchers to readily program their own online interactive experiments in a point-and-click fashion. The official release of LIONESS Lab is planned for the summer of 2017.


Centre for Decision Research and Experimental Economics

Sir Clive Granger Building
University of Nottingham
University Park
Nottingham, NG7 2RD

telephone: +44 (0)115 951 4763
Enquiries: suzanne.robey@nottingham.ac.uk
Experiments: cedex@nottingham.ac.uk