Across the bidding landscape, testimonials remain stubbornly popular. Clients still use them, competitors still lead with them, and bid writers still reach for them when the deadline is tight. But in a modern, competitive procurement environment, a glowing endorsement from a previous client is rarely the differentiator it once was. Evaluators are looking for something more rigorous: structured evidence that demonstrates not just what you have done, but what you will do for them.
The Problem with Testimonials
There is nothing inherently wrong with a testimonial. It confirms that a client was satisfied, that a relationship was positive, and that the work was completed. In a consumer context, that can be entirely sufficient. In a competitive tender, however, it rarely moves the needle.
The reason is straightforward. By the time you are being scored on quality, your basic capability has usually already been tested through the buyer’s conditions of participation (section 22 of the Procurement Act 2023). The evaluator is not asking whether you have done comparable work before. They are asking how you will perform on this project, for this client, against these specific objectives.
A testimonial answers the first question but not the second. It tells the evaluator what a previous client thought of you in the past. It does not tell them what you will deliver in the future, and it gives them very little to work with when they are scoring your submission against a marking scheme.
Consider how a typical evaluator approaches a tender response. They have a scoring framework in front of them. They are looking for evidence that maps directly to the question being asked: how will the bidder manage risk on this project, how will they deliver the programme to time and cost, what is their approach to safety or sustainability? A testimonial saying that a previous client found you reliable and easy to work with does not score against any of those criteria. It fills space but adds little value.
The businesses that consistently score well in competitive tenders understand this. They have moved on from the testimonial model, and they are winning contracts as a result.
| What evaluators actually want Procurement evaluators are scoring your response against a defined marking scheme. They are looking for specific, structured evidence that answers the question asked. A testimonial describes sentiment. Evidence describes performance. In a scoring environment, only one of those is useful. |
Why the Industry Has Been Slow to Change
Testimonials persist in bids for a number of reasons, most of them understandable. They are quick to produce. They feel reassuring. And they have been used for so long that many businesses simply assume they are expected.
There is also a cultural element. For businesses that have built strong client relationships over many years, the instinct to let those clients speak on their behalf is a natural one. The problem is that a client who is willing to endorse you will almost certainly be willing to provide you with specific, measurable data about your performance if you ask them for it. A data-driven evidence piece and a testimonial are not mutually exclusive. They draw on the same relationship. But one of them is far more useful in a tender context.
The shift towards evidence-based bidding has been driven primarily by the major infrastructure procurement frameworks, particularly those used by National Highways and other large public sector clients. These frameworks introduced structured requirements for performance data, continuous improvement narratives and forward-looking outcome predictions. The businesses that learnt to respond to those requirements found that the same approach worked across a much broader range of procurement environments.
The lesson from that experience is transferable. Whether you are bidding for a facilities management contract, a professional services framework, a construction subcontract or a public sector consultancy appointment, the principles of structured evidence apply. The market has moved. Testimonials, on their own, have not kept pace with it.
From Case Study to Evidence: The Trilogy Approach
At JGP Consultancy Services, we use a structured methodology for building bid evidence that we call the trilogy approach. It was originally developed in the context of National Highways procurement, where the requirements for performance data and outcome prediction are particularly rigorous, but we have applied it successfully across a wide range of sectors and contract types.
The methodology works on a straightforward principle. Most businesses already have the raw material for strong bid evidence. They have completed projects, delivered improvements, solved problems and generated measurable results. What they often lack is a structured way of presenting that material so that it does full justice to their capability and maps directly to what the evaluator is looking for.
The trilogy approach organises that material into three distinct parts, each of which serves a specific purpose in the evaluator’s assessment.
| Part 1: What We Did | Part 2: How We Improved | Part 3: Relevance |
| Looking back: the problem | Looking back: the solution | Looking forward: the prediction |
| Identify the shortfall, challenge or gap in performance | Describe the solution you implemented, including process, innovation or efficiency measure | Extrapolate the people, process or product to the current buyer and project |
| Be specific: what was the need, and what were the lessons learnt? | Provide clear, quantified results. Data, not description. | Predict the measurable betterment: savings in time, cost, safety improvements or environmental gains |
| This section is static and does not change between bids | This section is static and does not change between bids | This section is tailored specifically to each buyer’s objectives and project deliverables |
Part 1: What We Did
The first part establishes the context for your evidence. It describes a real situation: a challenge you faced, a gap in performance you identified, a lesson you took from a previous project. This is not about presenting yourself in an unflattering light. It is about demonstrating that your business is capable of honest self-assessment, that you learn from experience, and that you have the maturity to recognise where improvement was needed.
Evaluators respond well to this kind of candour because it is relatively rare. Most bids present an uninterrupted record of success. A submission that acknowledges a challenge and then demonstrates how it was addressed tends to feel more credible, and more persuasive, than one that claims perfection throughout.
Part 2: How We Improved
The second part is where the evidence begins to take shape. It describes the solution you implemented: the process change, the innovation, the investment, the new approach. Crucially, it includes the results, and those results must be expressed in data rather than description.
This is the point at which many bid responses fall short. They describe what they did without quantifying what it achieved. The distinction matters enormously. Saying that you improved your delivery programme is a claim. Saying that you reduced programme overrun by 18% across five contracts over two years is evidence. Evaluators are looking for the latter, and a scoring framework will reward it accordingly.
The data does not need to be dramatic to be effective. A consistent 3% reduction in defect rates, a measurable improvement in near-miss reporting, a demonstrable reduction in cost variance across a portfolio of projects: these are the kinds of figures that build a compelling evidential picture when they are presented clearly and honestly.
Parts 1 and 2 together constitute what most people would recognise as a case study. They look back at something you have done and explain what it achieved. That alone is a significant improvement on a testimonial. But it is Part 3 that transforms a case study into genuine bid evidence.
Part 3: Relevance
The third part is the most important and, in our experience, the most consistently underused. It takes the performance you have described in Parts 1 and 2 and extrapolates it forward, connecting it explicitly to the project you are bidding for and the objectives of the client in front of you.
This extrapolation should be specific. It should reference the buyer’s stated priorities, whether those are programme certainty, cost reduction, safety performance, environmental outcomes or something else, and it should predict, on the basis of your past performance, what betterment you expect to deliver against each of those priorities.
The reason this is so powerful is that it answers the evaluator’s actual question. They are not asking what you did for a previous client. They are asking what you will do for them. Part 3 answers that question directly, and it answers it with evidence rather than assertion.
| The key insight Parts 1 and 2 look backwards. They are a record of past performance and they remain consistent across bids. Part 3 looks forward and can be tailored to any client or project by adjusting the extrapolation to align with the specific objectives in front of you. The same core evidence piece can therefore support multiple bids without losing its integrity or its relevance. |
Why This Approach Is So Adaptable
One of the most practical advantages of the trilogy methodology is its flexibility. Because Parts 1 and 2 are a static record of what your business has actually achieved, they do not change between bids. They can be written, reviewed and stored as a library of evidence pieces, each one covering a different area of performance: safety, sustainability, programme management, cost control, innovation, stakeholder engagement and so on.
When a new tender lands, the bid team does not need to start from scratch. They select the evidence pieces most relevant to the contract, review the buyer’s objectives and key performance indicators, and then write or update Part 3 for each piece, aligning the forward-looking prediction directly to what this particular client has said they want.
The result is a bid that feels specifically tailored to the buyer because in the most important respect it is, while also being grounded in a rigorous and consistent evidential record that has been built up over time.
This approach also has a secondary benefit that is worth noting. The process of building an evidence library forces a business to look honestly at its own performance data, to identify where the numbers are strong and where they are less so, and to prioritise improvement in the areas that matter most to the clients it wants to work with. In that sense, the methodology is not just a bid writing tool. It is a performance management discipline.
Where This Approach Works Best
The trilogy methodology was developed in the context of major infrastructure procurement, where the marking frameworks are detailed, the evaluators are experienced and the expectations around evidence are well established. National Highways, formerly Highways England, along with Network Rail and other major public sector clients, have all, over many years, refined their assessment criteria in ways that reward exactly this kind of structured, data-driven response.
However, the same principles apply far more broadly. We have used this approach with clients bidding for facilities management contracts, professional services appointments, construction framework places, technology contracts and local authority commissions. In each case, the fundamental dynamic is the same: the evaluator has a scoring framework, they are looking for evidence that maps to specific criteria, and the businesses that provide that evidence in a clear and structured way consistently outperform those that rely on narrative and endorsement.
The approach works particularly well in any procurement environment where social value, continuous improvement, innovation or sustainability are weighted criteria. These are areas where a purely testimonial approach is especially weak, because they require demonstrable outcomes rather than expressions of client satisfaction.
It is also worth noting that this is not a methodology reserved for large businesses with sophisticated bid teams. Some of the most effective evidence pieces we have helped clients develop have come from small businesses with a strong track record and the willingness to be specific about what that track record actually shows.
Making the Transition
For businesses that have relied on testimonials and narrative case studies in their bids, the shift to a data-led approach can feel daunting. The most common concern we hear is that the data does not exist or is not readily accessible. In our experience, that is rarely true. What is more often the case is that the data exists but has not been captured, organised or presented in a way that makes it useful for bidding purposes.
The practical steps towards a more evidence-based approach are straightforward, even if they require some initial investment of time.
- Audit your existing performance data. Look at what you measure across your projects or contracts and identify where you have consistent, comparable figures over time. Even imperfect data, presented honestly, is more valuable than no data at all.
- Identify your strongest performance areas. These are the areas where your numbers are good and where you can make a credible forward-looking prediction. They are the natural starting point for building your evidence library.
- Build your Part 1 and Part 2 narratives. Write them once, review them carefully and store them. They will not need to change unless your performance changes, in which case updating them is itself a useful discipline.
- Develop a template for Part 3. This is the section that changes between bids, so having a clear template makes the tailoring process quick and consistent. The template should prompt the writer to reference the buyer’s stated objectives, connect them explicitly to the data in Part 2 and express the predicted betterment in specific, measurable terms.
- Review your approach to client data. If you do not currently capture performance metrics routinely, put a process in place to do so. The evidence you collect on your current contracts will underpin the bids you submit in two or three years’ time.
| A practical note You do not need to abandon testimonials entirely. A strong client reference still has value in the right context, particularly at pre-qualification stage or in a conversation with a new client. The point is that in a scored tender response, testimonials should not be doing work that structured evidence can do better. Use both, but understand the role of each. |
The Bottom Line
Procurement has become more sophisticated, and the expectations of evaluators have risen accordingly. A bid that relies on reputation and endorsement is competing on a different basis to one that is grounded in structured, quantified evidence of past performance and a clear, data-backed prediction of future outcomes.
The businesses winning the most competitive tenders are those that have made the shift. They have done the work of building an evidence library, developing a consistent methodology for presenting it and tailoring it precisely to each buyer they approach. They are not relying on previous clients to do their selling for them. They are doing it themselves, with numbers.
The trilogy approach we have outlined in this article is not complicated. It does not require sophisticated technology or large amounts of resource. What it requires is discipline: the discipline to capture your performance data, to be honest about it, and to present it in a way that speaks directly to what the evaluator in front of you needs to see.
If your bids are currently relying more on testimonials than on evidence, that is worth addressing. Not because testimonials are dishonest, but because they leave points on the table that your competitors may be picking up.
About JGP Consultancy Services
JGP Consultancy Services works with businesses to develop winning bids, improve procurement strategy and build the evidence and capability needed to compete effectively in complex markets. Our methodology has been developed and refined across major infrastructure, public sector and commercial procurement environments.
If you would like to discuss how the trilogy approach could strengthen your next bid, we would be delighted to hear from you.
This article is intended for general informational and thought leadership purposes. The methodology described reflects the proprietary approach developed by JGP Consultancy Services. All information is correct at the time of publication (March 2026).
© JGP Consultancy Services 2026. All rights reserved.