Cafodd amrywiaeth o arbenigwyr, gan gynnwys cynrychiolwyr o'r Sefydliad ar gyfer Cydweithrediad a Datblygiad Economaidd (OECD), What Works Centre for Wellbeing a Sefydliad Bevan, hefyd eu gwahodd i ddod i'r cyfarfod cyntaf, a byddant yn rhoi tystiolaeth i lywio'r broses o ddatblygu blaenoriaethau'r Tasglu.
A range of experts, including representatives from the Organisation for Economic Co-operation and Development (OECD), the What Works Centre for Wellbeing and the Bevan Foundation, were also invited to attend the first meeting and provided evidence to inform the development of Taskforce priorities.