Cross-selling fails as an aspiration

The strategy day always concludes that the structural clients should buy the environmental team, the planning clients should meet the transport practice, and everyone agrees warmly. A year later the cross-sell revenue line has not moved, because agreement was the only mechanism deployed.

Why it stalls

Partners do not introduce colleagues into their accounts for three rational reasons: they carry the relationship risk if the colleague disappoints, they often cannot describe the other service credibly, and nothing in their numbers rewards the referral. Culture is blamed; incentives and information are the actual defect.

Build the mechanism

• Whitespace made visible: for each key account, which services are bought, which never discussed
• A named cross-sell move per account plan, with an owner from each practice
• Introductions handled under warm-intro rules: the relationship owner keeps control and credit
• Referred work tagged at origin, so the contribution survives into the numbers

Then let evidence do the persuading: one well-run joint pursuit, told honestly inside the firm, recruits more partners than any away-day. Cross-selling grows at the speed of trust between practices, and trust grows through supervised, successful favours.