A meaningful share of a manager’s actual success depends on people who don’t report to them at all — vendors, contractors, external partners whose performance directly affects outcomes the manager is still held accountable for, without the formal authority that comes with a direct reporting relationship. Managing these relationships well is a genuinely distinct skill from managing an internal team, and it deserves the same deliberate attention.
Why Vendor Relationships Require a Different Approach Than Internal Management
With an internal team, a manager has formal authority, ongoing daily context, and typically a longer-term relationship to draw on. With an external vendor or partner, none of these are guaranteed to the same degree — influence has to be built more deliberately, through clear expectations, genuine relationship investment, and well-structured agreements, rather than relying on the kind of authority a direct reporting line provides.
Setting Up a Vendor Relationship for Success From the Start
Define expectations with genuine specificity before work begins. Vague expectations about quality, timing, or scope create room for misunderstanding that surfaces later, usually at a more costly and disruptive point than if it had been clarified upfront.
Establish clear communication norms early. Agreeing explicitly on how often updates will happen, through what channel, and who the actual point of contact is on each side prevents the kind of ambiguity that quietly erodes a working relationship over time.
Build in a genuine mechanism for addressing problems. Knowing, in advance, how a disagreement or performance issue will actually be raised and resolved — before one occurs — makes handling it considerably less fraught than improvising a process in the middle of an already tense situation.
Invest in the relationship beyond purely transactional interactions. A vendor who feels like a genuine, valued partner, not simply a transactional supplier, tends to go further when something unexpected arises — prioritising your account during a genuine capacity crunch, for instance, in a way a purely transactional relationship doesn’t reliably produce.
Managing the Relationship Well Once It’s Underway
Communicate consistently, not just when something goes wrong. A relationship where the only contact happens during a problem trains the vendor to associate hearing from you with bad news, rather than building the kind of ongoing, collaborative relationship that makes addressing an actual problem easier when one does arise.
Give specific, timely feedback, both positive and constructive. Vendors, like internal team members, perform better with clear, specific feedback about what’s working well and what needs to change, rather than either silence or feedback that arrives too late to actually be useful.
Hold genuine accountability without being unnecessarily adversarial. Being clear and firm about expectations that aren’t being met is legitimate and necessary; treating every interaction as an adversarial negotiation, even when things are going reasonably well, tends to damage a relationship that could otherwise be genuinely valuable.
Understand the vendor’s own genuine constraints. A vendor operates within their own limitations — capacity, other clients, their own supply chain — and understanding these constraints, rather than assuming unlimited flexibility should always be available, produces a more realistic, more durable working relationship.
Document significant agreements and changes. A brief, written confirmation of a significant decision or change protects both sides from later disagreement about what was actually agreed, and it’s a normal, professional practice rather than a sign of distrust.
How to Handle Genuine Performance Problems
Address a concern directly and early, rather than letting it accumulate. A specific issue, raised calmly and directly when it first appears, is considerably easier to resolve than the same issue allowed to compound silently over several instances before finally being addressed.
Focus on the specific, observable issue rather than a broader character judgement. “The last three deliveries have arrived later than the agreed date” is more productive and more actionable than a broader, more personal accusation about reliability in general.
Give the vendor a genuine opportunity to respond and improve, where the relationship and stakes warrant it. Most performance issues have a specific, addressable cause, and a direct conversation often reveals it — sometimes on your own side of the relationship as much as theirs.
Know when a relationship genuinely isn’t working, and be willing to make a change. Some vendor relationships, despite genuine effort to address problems, don’t improve — recognising this and being willing to transition to another partner, rather than persisting indefinitely out of inertia, is sometimes the right call.
A Practical Scenario
A manager overseeing a project that depends heavily on an external vendor notices a pattern of deliveries arriving progressively later than agreed, without much explanation offered proactively. Rather than letting frustration accumulate silently or escalating immediately to a formal complaint, she raises the specific pattern directly and calmly in a scheduled call, asking genuinely what’s driving the recent delays.
It turns out the vendor has been managing a genuine capacity constraint on their own side, which they hadn’t proactively flagged, assuming it wasn’t significant enough to raise unprompted. The direct conversation surfaces this, and together they adjust the delivery schedule to something more realistic given the vendor’s actual current capacity, while agreeing on a clearer process for proactively flagging similar issues in future. The relationship, addressed directly and specifically rather than left to quietly deteriorate, continues productively — a considerably better outcome than either silent frustration or an immediate, adversarial escalation would likely have produced.
Common Mistakes
Leaving expectations vague at the outset of a vendor relationship. This creates room for misunderstanding that typically surfaces later, at a more costly and disruptive point.
Only communicating with a vendor when there’s a problem to address. This trains the vendor to associate contact with bad news, rather than building the kind of ongoing relationship that makes addressing an actual issue easier.
Letting a performance concern accumulate silently rather than addressing it early and directly. A specific issue raised promptly is considerably easier to resolve than the same issue allowed to compound across several instances.
Treating every vendor interaction as adversarial, even when things are going reasonably well. This damages a relationship that could otherwise provide genuine, mutual value over time.
Action Steps
- Review a current vendor relationship for whether expectations were genuinely specific from the outset, or left vague in ways that could cause future misunderstanding.
- Establish or confirm clear communication norms with a key vendor — frequency, channel, and point of contact on each side.
- The next time you notice a specific vendor performance issue, address it directly and calmly rather than letting it accumulate silently.
- Invest in one vendor relationship beyond purely transactional interaction, to build the kind of goodwill that helps during an unexpected capacity crunch.
- Document a significant recent agreement or change with a key vendor in writing, if this hasn’t already been done.
Key Takeaways
- Managing external vendors and partners requires building influence deliberately, since it doesn’t come with the same formal authority as managing an internal team.
- Setting specific expectations, clear communication norms, and a genuine problem-resolution mechanism upfront prevents considerable friction later.
- Consistent communication, not just contact during a problem, builds a relationship that makes addressing an actual issue considerably easier.
- Addressing a performance concern directly and early, focused on specific, observable behaviour, is more effective than letting it accumulate or attacking character broadly.
- Some vendor relationships genuinely don’t improve despite good-faith effort, and recognising when to change partners is sometimes the right call.
Conclusion
A manager’s success often depends significantly on people outside their direct authority, and managing those relationships well is a genuinely distinct, learnable skill. Setting clear expectations from the start, communicating consistently rather than only during problems, addressing performance issues directly and early, and investing in genuine relationship value all build vendor and partner relationships that perform reliably — and that hold up considerably better than purely transactional ones when something unexpected inevitably arises.
Frequently Asked Questions
How is managing a vendor different from managing an internal team member?
A manager typically has formal authority and ongoing daily context with an internal team member, neither of which is guaranteed with a vendor — influence has to be built more deliberately through clear expectations and genuine relationship investment.
How specific should expectations be when starting a new vendor relationship?
As specific as possible regarding quality, timing, and scope — vague expectations create room for misunderstanding that typically surfaces later, at a more costly point.
Should I only contact a vendor when there’s a problem?
No — consistent communication, even when things are going well, builds a relationship that makes addressing an actual issue considerably easier when one does arise.
How should I address a vendor performance issue?
Directly and early, focused on the specific, observable behaviour rather than a broader character judgement, and with a genuine opportunity for the vendor to respond and explain.
When should I consider ending a vendor relationship rather than continuing to address problems?
When genuine, good-faith attempts to address a recurring issue haven’t produced improvement over a reasonable period — persisting indefinitely out of inertia isn’t usually the right call at that point.
Is documenting vendor agreements a sign of distrust?
No — it’s a normal, professional practice that protects both sides from later disagreement about what was actually agreed, regardless of how strong the relationship is.