The recruitment and onboarding of employees supporting parliamentary functions constitute a cornerstone of Members of Parliament’s success. While many MPs appoint former campaign volunteers, the skills required within a parliamentary context differ from those needed leading up to an election. A structured onboarding process—grounded in adult learning principles — bridges this gap and aligns staff competencies with the institutional framework of the House of Commons. This article outlines the strategy adopted by the Learning and Development Services of the House of Commons Administration to facilitate the integration of new Members’ employees. Drawing on a case study, the author examines each phase of the training design process—from initial needs analysis to the delivery of a recently implemented course entitled Introduction to Casework. This course, now included in the House of Commons training catalogue, aims to enhance the capacity of constituency office staff to effectively manage constituent inquiries and casework responsibilities