Provides methods for using differential equations as modelling objects as described in J. Ramsay G. and Hooker (2017,ISBN 978-1-4939-7188-6) Dynamic Data Analysis, New York: Springer. Data sets and script files for analyzing many of the examples in this book are included. This version corrects bugs and adds a new demo, CruiseControl. 'Matlab' versions of the code and sample analyses are available by ftp from < http://www.psych.mcgill.ca/misc/fda/downloads/Data2LD/>. There you find a set of .zip files containing the functions and sample analyses, as well as two .txt files giving instructions for installation and some additional information.