Why SAP S/4HANA implementations fail – and how to do it better

Are you about to introduce SAP S/4HANA? Or already in the middle of it and finding it bumpier than expected? Then you're not alone. Many companies that decide to migrate to S/4HANA start with high expectations. More transparency, leaner processes, a modern system architecture – the benefits seem obvious. But reality paints a different picture: numerous projects stall, some even fail[cite: 1].

Why? Because the switch to S/4HANA is more than a technical upgrade[cite: 1]. It's a profound transformation that affects the entire organization[cite: 1]. Anyone who underestimates this aspect risks not only time delays and cost explosions, but also frustration among employees[cite: 1]. In this article, we highlight the most common reasons why S/4HANA implementations fail – and what you can do concretely to do it better[cite: 1].

The most common reasons why S/4HANA projects fail

1. Lack of preparation – the classic among the stumbling blocks

Have you really prepared the S/4HANA implementation down to the detail? Many companies answer this question with a clear conscience: „Yes“[cite: 1]. In practice, however: the complexity and scope of the project are often underestimated[cite: 1]. Unrealistic timelines, budgets that are too tight and a lack of alignment between departments are not uncommon[cite: 1].

Yet the migration to S/4HANA isn't a pure IT project, but a strategic initiative that affects all areas of the company[cite: 1]. Without professional project management that involves all stakeholders and defines clear responsibilities, risks don't stay theoretical for long[cite: 1]. They quickly become reality[cite: 1].

Questions you should ask yourself:

• Did we involve the entire organization early?[cite: 1]
• Is there overarching project management with sufficient resources?[cite: 1]
• Is the timeline realistic – even taking unforeseeable hurdles into account?[cite: 1]

2. Missing change management – the underrated success factor

S/4HANA changes more than just the IT landscape[cite: 1]. It also changes ways of working, responsibilities and processes[cite: 1]. Anyone who pushes change management onto the back burner or even ignores it pays for it later[cite: 1]. Because without acceptance in the organization, even the best system remains a paper tiger[cite: 1].

The problem: change management is often dismissed as a „soft“ topic[cite: 1]. In fact, it's the lever with which you reduce resistance, avoid uncertainty and turn your employees into active co-shapers[cite: 1]. The earlier you integrate change management into your project, the better[cite: 1].

Questions you should ask yourself:

• Have we developed a clear change strategy?[cite: 1]
• Do our leaders know how to guide the change?[cite: 1]
• What fears and uncertainties are there – and how do we deal with them?[cite: 1]

3. Missing communication – no trust without information

How well are your employees really informed? Often they're only told once decisions have long been made[cite: 1]. That creates mistrust – and resistance[cite: 1].

Open and regular communication is essential[cite: 1]. Not only about the current status of the project, but also about the impact on everyday work[cite: 1]. If you involve your teams early and give them the chance to ask questions and give feedback, you win allies instead of critics[cite: 1].

Questions you should ask yourself:

• Do we communicate regularly, openly and understandably?[cite: 1]
• Can employees actively raise their questions and concerns?[cite: 1]
• Have we established structured stakeholder management?[cite: 1]

4. Insufficient training – knowledge is power

A new system is worth nothing if users don't know how to use it[cite: 1]. Anyone who doesn't train their employees in time risks acceptance problems, errors and frustration[cite: 1].

Especially important are the so-called key users: they are the multipliers in the departments and the first point of contact for questions and problems[cite: 1]. A sound training concept, ideally as part of a „train-the-trainer“ approach, is therefore essential[cite: 1].

Questions you should ask yourself:

• Did we invest in training early?[cite: 1]
• Are our key users fit enough to support their colleagues?[cite: 1]
• Is there a plan for continuous training – even after go-live?[cite: 1]

Which implementation approach fits your company?

Not every company starts from the same point[cite: 1]. That's why there are different approaches for migrating to S/4HANA[cite: 1]. Choosing the right path is decisive for the success of your transformation[cite: 1].

Brownfield approach – evolution instead of revolution

Do you want to largely keep your existing SAP landscape and migrate it to S/4HANA? Then the brownfield approach is the right choice[cite: 1]. The advantage: you keep proven processes and data[cite: 1]. The disadvantage: inefficient legacy processes are often carried over along with them[cite: 1].

Suitable for: companies that already use standardized SAP processes and don't aim for a fundamental realignment of their business processes[cite: 1].

Greenfield approach – a fresh start on a green field

With the greenfield approach, you start from zero[cite: 1]. That means: you redesign your processes completely and use the chance to leave legacy baggage behind[cite: 1]. The effort is higher – but so is the potential to realize lasting process improvements[cite: 1].

Suitable for: companies with complex, historically grown SAP systems, or those wanting to radically redesign their processes[cite: 1].

Bluefield approach – the best of both worlds

The bluefield approach combines the advantages of brownfield and greenfield[cite: 1]. Here you keep proven processes while setting up other areas anew[cite: 1]. This offers a balanced trade-off between efficiency, innovation and risk minimization[cite: 1].

Suitable for: companies that want to both secure existing processes and unlock new potential, without overhauling the entire IT landscape[cite: 1].

Which operating model fits you?

When it comes to the right operating model, too, you should proceed strategically[cite: 1]. Cloud or on-premise? A decision that has implications for flexibility, control and cost[cite: 1].

• Private cloud: You keep control over your systems and data, but need your own resources for operation and maintenance[cite: 1].
• Public cloud: You benefit from lower infrastructure costs and faster implementation[cite: 1]. At the same time, you have to make compromises on customization[cite: 1].
• On-premise: Maximum control – with maximum effort at the same time[cite: 1]. For companies that have to meet regulatory requirements or process sensitive data, on-premise can be the right choice[cite: 1].

Questions you should ask yourself:

• How high is our need for flexibility?[cite: 1]
• Which regulatory requirements do we have to meet?[cite: 1]
• Which resources are available to us for operations in the long term?[cite: 1]

Conclusion: why S/4HANA projects only succeed with a holistic approach

Introducing SAP S/4HANA isn't an IT project[cite: 1]. It's a company-wide transformation that takes technical, organizational and human aspects into account equally[cite: 1]. Those who think all three dimensions together – preparation, change management and technology – significantly increase their chances of success[cite: 1].

In short: plan holistically[cite: 1]. Communicate transparently[cite: 1]. Train your teams[cite: 1]. And choose the implementation approach and operating model that really fit you[cite: 1].

Why grandega is the right partner for your S/4HANA transformation

With grandega, you gain more than just an implementation partner[cite: 1]. We guide you along the entire way – from strategy development through technical delivery to lasting change management[cite: 1]. Our goal: to shape your S/4HANA implementation so that it's not only successful, but effective in the long term[cite: 1].