Cross Selling in Multi-Disciplinary Firms

Cross-selling is the practice of introducing complementary services to existing clients, a strategy especially powerful for multi-disciplinary firms. Rather than chasing new business, professionals deepen relationships by solving more of a client’s challenges through integrated offerings. This approach lowers acquisition costs, increases win rates, and cements firms as trusted advisors. With examples from engineering, architecture, and environmental consulting, cross-selling demonstrates how one service engagement can open doors to broader collaborations.

This series explores cross-selling in multi-disciplinary firms, where opportunities often go unrealized because teams stay siloed. Effective cross-selling isn’t about being pushy with clients—it’s about creating regular, proactive conversations between colleagues. Twennie’s prompt set introduces five small but powerful activities—knowledge swaps, coffee talks, project sheet exchanges, problem-solving sessions, and friendly competitions—that make cross-disciplinary collaboration routine rather than rare.

This video presents a focused framework to make business development meetings productive and worth their cost. It argues that meetings can fail if they have unfocused agendas and lack of action. The solution is to narrow the purpose to winning work and apply a strict agenda filter. Discussions are organized into three stages: research (market awareness), positioning (actions on opportunities), and proposals (active pursuits). Each stage emphasizes clarity, contribution, and next steps.

Cross-selling is often talked about but rarely practiced well in multi-disciplinary firms. This prompt set provides 20 concrete activities your teams can try right away—short, time-boxed experiments like joint coffee chats, exchanging project sheets, shadowing client calls, or creating “combo case” slides. Each exercise encourages collaboration, sparks curiosity about other disciplines, and surfaces hidden opportunities to expand work with existing clients.

This handbook helps technical consulting professionals chair business development meetings that produce meaningful action instead of unfocused discussion. It introduces agenda filters, meeting structures, positioning exercises, market research integration, and proposal-stage strategies designed to keep senior professionals aligned around winning work. The workbook also teaches meeting chairs how to maintain momentum, prevent “rabbit hole” technical discussions, assign accountability, and turn market intelligence into strategic action.