Study Haeck et al. (2016): study ZZ 2012
- Public
 - Users of a 6 week online psychoeducation course, 35 nations, 201?
 - Survey name
 - Unnamed study
 - Sample
 - Respondents
 - N = 122
 - Non Response
 - Assessment
 - Questionnaire: Conputer Assisted Web Interview (CAWI)
 
Correlate
- Authors's Label
 - Change in affect before-after course
 - Our Classification
 - 
            
 - 
                        
 - Remarks
 - None of the lessons mentioned or provided instructions for spefific happiness increasing activities
 - Related specification variables
 - 
                
 - 
                            
 - Operationalization
 - Participants were e-mailed a link to a web-based lesson each week for six weeks. Each lesson focussed on a different aspect of fostering positive emotions, including
a: meaning and purpose
b; strenghts
c; work
d; mindfulness and savouring
e: gratitude and relationships
f: hedonia versus eudaimonia
Each lesson contained video's, blog posts and questionnaires with normative feedback. 
Observed Relation with Happiness
- positive affect: +1,44 (05)
- negative affect: -4,77 (01)
Hence gain in Affect balance +6,21
Greater change in happiness among users who:
- had most negative affect at baseline
- spend less time on the website
- practiced more happiness increasing behaviours