Several functions in one: a journalling app with templates for many different topics and situations to analyse or a customise tool to write your own entries, mood enhancing activities sorted in six different categories from productivity to enjoyment and with customisable suggestion function (there are so many different ways to find an activity that its sure you will find at least one or two to fit your needs), a thought checking tool to analyse and modify thought habits (the list of common distortions is a great shorthand) and a mood chart to track your mood curve. All this very well designed to export journal entries, set dates for activities. Makes great use of the iPhone/iPod environment. All the scientific and psychological merits aside (and despite the somewhat clinical design) this app is also great fun - like a good mentor or guide in your pocket. Very grateful I found this!