Plain-English definitions of the terms that quietly decide technology deals — what they mean, why they cost you, and how to get ahead of them before you sign.
Vendor lock-in is the cost and difficulty of switching away from a supplier once you depend on their proprietary formats, integrations, or data.
Lock-in is invisible at signing and only surfaces when you try to leave: proprietary data formats, custom integrations, retrained staff, and egress fees all raise the exit cost. Quantify it before you commit by projecting the switching cost at years 3, 5, and 7 — Benchside ranks every architecture decision by lock-in risk and estimates the dollar cost to migrate off.
Scope creep is the uncontrolled expansion of a project's requirements after the contract is signed, usually surfacing as change orders.
What a vendor quietly moves to a 'future phase' during scoping resurfaces later as a six-figure change order. The defense is a locked scope with testable acceptance criteria and a commitment ledger that flags anything dropped between proposal versions. Benchside's Scope-Drift Sentinel tracks exactly this.
A change order is a contractual amendment that adds cost or time to a project for work outside the original agreed scope.
Change orders are where fixed-fee proposals make their margin: anything excluded or left ambiguous becomes billable later, often with no price ceiling. Demand a change-order cap and a register of exclusions with dollar-impact estimates before signing.
Total cost of ownership is the full lifetime cost of a system — licensing, implementation, integration, change orders, and renewal uplifts — not just the quoted price.
The quoted price is typically a fraction of TCO; change orders, integration work, and renewal uplifts routinely inflate it two to three times. Model TCO across the full term before signing so the board isn't surprised mid-implementation.
Switching cost is the total expense — financial, technical, and operational — of moving from one vendor or platform to another.
Switching cost is the engine of vendor lock-in. Drivers include data egress and reformatting, re-integration, staff retraining, and parallel-run periods. Projecting it at years 3, 5, and 7 turns an invisible risk into a number you can negotiate against.
A vendor interrogation kit is a structured set of questions a buyer asks a vendor to expose risk, hidden cost, and uncommitted claims before signing.
Good interrogation questions come with a good-answer and red-flag-answer guide so a non-specialist can read the room. Benchside generates 40–60 calibrated questions per deal, sized to the budget and vendor and grouped by category (data migration, integration, licensing, support, security).
Demoware is functionality a vendor shows in a demo that is not actually committed in the contract or proposal.
The gap between what's demonstrated and what's contractually committed is one of the most common post-signature surprises. A demo-to-reality audit catalogues each demoed claim and checks whether it appears on paper — Benchside's Demo-to-Reality Auditor flags what to get in writing.
A scope package is a buyer-authored definition of exactly what a project must deliver, with testable acceptance criteria and explicit exclusions.
Authoring scope before the vendor does shifts the asymmetry: you set the requirements, the acceptance tests, and the red lines, then evaluate proposals against them. A strong scope package lists vendor exclusions with dollar-impact estimates and change-order zones with prevention clauses.
An RFP is a document a buyer issues to solicit structured proposals from vendors against a defined set of requirements.
RFPs only work when the requirements are specific and comparable; vague RFPs produce proposals scoped so differently you can't compare them like for like. Pair the RFP with a locked scope and a gap analysis that scores how much of that scope each proposal actually covers.
Vendor asymmetry is the structural information advantage a vendor's pre-sales team has over a buyer who evaluates that category for the first time.
The vendor has run the playbook hundreds of times and knows every trap; the buyer walks in once. Closing the gap means arming the buyer with the same depth — the questions, the exclusions, the lock-in math — before the first meeting. That is precisely what buyer-side deal intelligence does.
An architecture decision map lays out the key technical choices in a deal, the options for each, and their cost, timeline, and lock-in trade-offs.
It surfaces the decisions a vendor would rather make for you — data residency, integration pattern, environment strategy — and ranks them by lock-in risk, with an engineer's dissent on the vendor's recommended approach.
AI vendor evaluation is the process of assessing an AI/LLM provider's contractual, technical, and regulatory risk before adopting their model or platform.
Generic procurement frameworks miss AI-specific risk: model deprecation and behaviour-change notice, training-data indemnification, a quality SLA distinct from uptime, agentic spend ceilings, fine-tuned weight return on exit, and EU AI Act / ISO 42001 obligations. Evaluate these explicitly when the vendor is OpenAI, Anthropic, Azure OpenAI, AWS Bedrock, or Google Vertex AI.
A statement of work is the contractual document defining exactly what a vendor will deliver, including scope, deliverables, timeline, and acceptance criteria.
The SOW is where scope is won or lost. Vague deliverables and missing acceptance criteria become change orders; specific, testable deliverables protect the buyer. Treat the SOW, not the sales deck, as the source of truth.
A master service agreement is the overarching contract setting the legal terms between a buyer and vendor, under which individual statements of work are executed.
The MSA governs liability, indemnification, data handling, termination, and IP; the SOW governs the specific work. Negotiate the MSA's exit, data-return, and liability terms carefully — they outlast any single project.
Acceptance criteria are the specific, testable conditions a deliverable must meet for the buyer to consider it complete and approved.
A requirement without an acceptance test is a dispute waiting to happen. Good criteria are measurable ('syncs 100K records in under 10 minutes with zero data loss'), so 'that's not what we meant' can't become a billable change.
Hypercare is the intensive support period immediately after go-live when the vendor provides heightened staffing to stabilise the system.
Most enterprise go-lives need 72–96 hours of hypercare, yet proposals often under-scope it. Pin down the hypercare period, staffing level, and a named senior lead in the contract — a compressed cutover with thin hypercare is a critical risk signal.
A true-up is a vendor's reconciliation of actual usage against contracted licences, often resulting in an unexpected charge for over-use.
True-ups are a routine source of post-go-live cost, especially in ERP and enterprise platforms with named-vs-concurrent metering. Clarify the metering and cap the financial exposure in writing before signing.
Data residency is the requirement that data is stored and processed in a specific geographic location, often for legal or regulatory reasons.
Residency affects compliance (GDPR, data sovereignty) and sometimes latency and cost. Confirm where data is stored and processed — and where backups and sub-processors sit — before assuming a vendor meets your obligations.
A service level agreement is a contractual commitment to a measurable level of service, such as uptime, with a defined remedy when it's missed.
An uptime SLA doesn't capture everything — an AI system can be fully available and still produce poor output. Where quality matters, negotiate a quality SLA distinct from availability, with acceptance thresholds and a remedy for regression.
Shelfware is software a company has licensed and paid for but does not actually use.
Shelfware is pure waste, usually born of over-buying seats or modules during an enthusiastic evaluation. Right-size the licence to real adoption, and negotiate the ability to scale up rather than paying upfront for capacity you may never use.
A proof of concept is a limited, time-boxed trial to validate that a vendor's solution works for the buyer's specific use case before committing.
A good POC has defined success criteria agreed in advance, so the result is a clear pass or fail rather than a vibe. Vendors prefer open-ended POCs that build momentum; buyers should insist on measurable, use-case-specific tests.
Vendor risk management is the practice of identifying, assessing, and mitigating the risks a third-party vendor introduces to an organisation.
VRM spans security, compliance, financial stability, and operational dependency. The most overlooked dimension is concentration risk — how hard and expensive it would be to replace the vendor if they failed, raised prices, or were acquired.
Data portability is the ability to export your data from a vendor's system in a usable, non-proprietary format so you can move it elsewhere.
Portability is the antidote to lock-in. Before signing, confirm the export format, the cost, and the timeline for a complete data return on exit — including derived artifacts like embeddings or fine-tuned model weights for AI platforms.
Put these to work on a real deal
Start your first project free — Benchside turns every term above into the questions, exclusions, and lock-in math for your specific vendor.