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Increasing workplace giving (second study)
Last registered on January 31, 2019


Trial Information
General Information
Increasing workplace giving (second study)
Initial registration date
January 29, 2019
Last updated
January 31, 2019 3:12 AM EST
Primary Investigator
Behavioural Economics Team of the Australian Government
Other Primary Investigator(s)
Additional Trial Information
Start date
End date
Secondary IDs
This study examines the effectiveness of applying behavioural insights to communications in order to increase workplace-giving signup
External Link(s)
Registration Citation
Team Registration, BETA. 2019. "Increasing workplace giving (second study)." AEA RCT Registry. January 31. https://doi.org/10.1257/rct.3833-1.0.
Former Citation
Team Registration, BETA. 2019. "Increasing workplace giving (second study)." AEA RCT Registry. January 31. https://www.socialscienceregistry.org/trials/3833/history/40875.
Experimental Details
Two interventions (presented individually and in combination) were distributed to staff members via email.
Intervention Start Date
Intervention End Date
Primary Outcomes
Primary Outcomes (end points)
Primary outcome: Participation in the organisation’s workplace giving program (where providing any donation counts as 1 and otherwise 0).
Primary Outcomes (explanation)
Secondary Outcomes
Secondary Outcomes (end points)
Secondary outcome: Average amount of money per employee directed to workplace giving each fortnight
Secondary Outcomes (explanation)
Experimental Design
Experimental Design
A four-arm 2x2 factorial randomised trial. Data (changes in WG) will be tracked for two full pay periods (four weeks) after the intervention delivery.
Experimental Design Details
The trial is a 2x2 factorial design, thus it has two independent variables (IV) each with two levels. IV.A - Messenger The email were sent from either a member of the DSS senior executive service (SES) or a non-SES staff member (peer). Emails differed only in the name of the sender and their photo. IV.B - Signup system Emails included a link to either the current signup information page (current) or a simplified signup form (simplified).
Randomization Method
Randomisation occured in blocks, defined by the following pre-treatment covariates:
• Current workplace giving status (yes/no)
• Income level (below median/above median).

Within each block individuals were randomly assigned to four groups using complete random assignment. Assignment was balanced (that is, an equal number in each treatment group) to the extent that blocks allow.
Randomization Unit
Individual employees.
Was the treatment clustered?
Experiment Characteristics
Sample size: planned number of clusters
Not applicable.
Sample size: planned number of observations
2,250 staff measured at baseline and two follow-up points (2 and 4 weeks after intervention delivery).
Sample size (or number of clusters) by treatment arms
Participants in the trial will be 2,250 staff. The assignment ratio between experimental groups will be 1:1:1:1
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)
We performed power calculations using simulation for the impact of each of our two interventions. This indicated that at an alpha of 5%, we will have 80% power to detect a standardised effect of 0.11. This is equivalent to a change in workplace giving participation from 1.4% to 3.1%. These calculations assume no interaction effect between the impact of the messenger and the impact of the signup system.
IRB Name
BETA Ethics Committee
IRB Approval Date
IRB Approval Number
BETA ETH 2018 – 03
Analysis Plan

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Post Trial Information
Study Withdrawal
Is the intervention completed?
Is data collection complete?
Data Publication
Data Publication
Is public data available?
Program Files
Program Files
Reports and Papers
Preliminary Reports
Relevant Papers