There is a conversation that plays out in boardrooms with unsettling regularity. A company has been running Lean for several years. The early wins were real, but the returns have begun to flatten. Someone at the table, usually the person who has heard the word “kaizen” one too many times, puts forward a proposal: it is time to move on. Industry 4.0 is the future. Digital transformation is the story leadership wants to tell. The Lean budget gets quietly redirected. A technology vendor is brought in. And within eighteen months, the organisation has spent considerably more than Lean ever cost, with results that are considerably harder to explain.
Sachin Kotasthane has been in those rooms. As Global Director for Manufacturing Solutions at HCLTech, he has watched this scenario unfold across plants in India and around the world. He has also seen the other outcome: digital rollouts that worked cleanly, scaled quickly, and delivered results that showed up not just in dashboards but in actual operating performance. The difference, he says, was rarely about the technology platform, the vendor, or the size of the budget. It was about whether the organisation had done serious Lean work before it went anywhere near digital.
The Paint Shop That did it Right
The clearest example Kotasthane draws on is not a failure. It is a success, and precisely because it was a success, it taught him something that has shaped every digital engagement he has led since.
A vehicle monitoring and booking management solution was deployed at the paint shop of a manufacturing plant, but only after three years of sustained Lean implementation. The go-live was smooth. Adoption was strong from week one. The data coming off the system was clean, consistent, and actually usable. Within six months, OEE had risen by double digits and defect rates had fallen measurably.
When Kotasthane investigated what had made this deployment work where others had not, the answer was not the software. The Lean programme had already documented standard work for every critical process. When the digital system came in, it had a known, stable standard to compare against. It was not trying to make sense of inconsistent, shifting information. It was measuring deviation from an agreed baseline. That is what digital tools are built to do, and that is the only condition under which they do it well.
The Lean programme had done the harder, slower work: it trained operators, built confidence on the shop floor and at the management level, and eliminated the process variation that would otherwise have made the data meaningless. Digital amplified what Lean had already established. Without the foundation, the amplification would have had nothing to work with.
Automating Dysfunction
This is Kotasthane’s sharpest argument, and it is worth sitting with. Digital implementation without a prior Lean foundation is not a factory digitisation programme. It is a programme for automating the dysfunction of a factory, at a higher cost and at a faster pace.
He makes this point plainly when evaluating whether an organisation is genuinely ready for digital investment. He asks three questions. What does your standard work documentation look like? Can you share your process capability data? Show your baseline OEE and how stable it has been over the past year.
If those exist and are reasonably reliable, a digital investment is very likely to return value. If the answer is “we will use the digital system to establish those baselines” — a response he received when walking into a switchgear manufacturing plant — then the organisation is on track to spend significant capital collecting precise data on an imprecise process. The data will be accurate. What it describes will not be. No dashboard, however well designed, fixes a broken process. A more efficient reporting of disorder is still disorder.
The False Choice
The Lean-versus-Digital framing persists, Kotasthane argues, because it serves certain interests and flatters certain instincts. Leadership teams under pressure to show transformation gravitate toward Digital because the language around it is modern, fast-moving, and legible to boards and investors. Lean is incremental. It requires patience. After a decade of kaizen workshops, it can feel like the opposite of ambition.
Technology vendors, for their part, do not have a commercial incentive to tell prospective clients that the investment will underperform without foundational operational discipline already in place. So the conversation rarely happens before the contract is signed.
The result is a false binary: either you commit to Digital and move forward, or you stick with Lean and fall behind. Kotasthane rejects both sides of this framing. Lean and Digital are not competing philosophies fighting for the same budget. They are different instruments operating in sequence, each one making the other more effective.
Lean asks where the waste is and how to remove it through people and process. Digital asks how to accelerate the discovery of variation, support better decisions, and sustain improvement at scale. These are not the same questions. They are consecutive questions, and they need to be answered in the right order.
What the Lighthouse Factories Already Know
The manufacturers who have moved furthest in Industry 4.0 implementation, the Lighthouse factories identified through McKinsey’s research, are not organisations that chose Digital over Lean. They are organisations that built strong Lean foundations and then used digital capability to extend and accelerate what Lean had already established. The sequencing was deliberate.
Kotasthane’s conclusion is not that one approach is superior to the other. It is that the question of superiority is the wrong question. Lean without digital eventually reaches a ceiling; there are forms of waste invisible without real-time data. Digital without Lean produces precise measurements of an imprecise process. Together, they form the most powerful operating system available to any manufacturer.
The manufacturers who will be in good shape a decade from now are not those who made the boldest digital bets, nor those who stayed loyal to continuous improvement while the rest of the world moved on. They will be the ones who understood that Lean and Digital are a single system, each dependent on the other, and who had the discipline to sequence them correctly. Stop choosing. Start sequencing.
