Why successful integration depends on extending Shared Mental Models

Most merger integration programs focus heavily on systems, structures, governance, reporting lines, and process standardisation.

These activities are important.

However, many integration failures occur not because systems fail to integrate, but because people fail to develop a sufficiently shared understanding of the new organisation. Researchers have long argued that the human, cultural, and sociocultural dimensions of mergers are often overlooked despite playing a critical role in implementation success (Nahavandi, 1988; Sarala, 2019).

In practical terms, mergers often begin with two or more established Trust Islands.

Each organisation brings its own:

• language,
• assumptions,
• stories,
• norms and values,
• ways of working,
• informal networks,
• decision-making practices,
• and interpretations of reality.

Although the combined organisation may seem structurally unified, these differences often remain beneath the surface.

The result is often the emergence of silo behaviour.

Supporting Shared Meaning Through Structure

As Shared Mental Models begin to align, organisations often benefit from reinforcing this emerging understanding through common organisational artefacts.

As organisations begin to develop shared language and shared understanding, it can be useful to reinforce this understanding through common organisational artefacts. Business Capability Models (BCMs) help establish a shared understanding of organisational responsibilities and services, while Common Data Models (CDMs) help establish a common language for information and meaning. Together, they provide structural support for the Shared Mental Models that emerge through Socialisation.

🔗 See also:

Common Data Models and Organisational Meaning.

Business Capability Modelling — Beyond Organisational Charts and Process Maps

The Emergence of Silo Culture

Silos are frequently viewed as structural problems.

Research suggests they are also relational and psychological phenomena. Groups often develop strong internal identities and trust while becoming increasingly disconnected from the broader organisation. Over time, these boundaries can reinforce “ingroup” and “outgroup” thinking, making integration more difficult. (Cilliers & Greyvenstein, 2012; Sarala, 2019).

Over time, this may lead to:

• “us and them” thinking,
• competing interpretations of reality,
• inconsistent priorities,
• reduced knowledge sharing,
• duplication of effort,
• increased coordination overhead,
• and fragmented Shared Mental Models.

The challenge, therefore, is not simply integrating systems. The challenge is preventing Trust Islands from becoming silos.

Integration as Socialisation

From an organisational learning perspective, merger integration can be viewed as a large-scale Socialisation exercise.

People must learn:

• how others work,
• why they work that way,
• what constraints they face,
• what language they use,
• what norms and values they adhere to,
• and how they interpret their environment.

This learning cannot be achieved solely through presentations, organisational charts, policy documents, or team-building exercises.

It requires direct engagement with the realities of work.

This perspective aligns closely with Nonaka and Takeuchi’s (Nonaka & Takeuchi, 2007)  concept of Socialisation, where tacit knowledge is shared through direct experience, observation, participation, and shared practice. It also reflects research suggesting that mergers create opportunities for organisations to learn from one another’s routines, knowledge bases, and ways of working (Leroy, 1997).

Socialisation in Gemba

The most effective integration activities often occur in Gemba, where:

• People work together.
• They solve problems together.
• They visit each other’s sites.
• They hear each other’s stories.
• They observe constraints, trade-offs, and consequences first-hand.

These shared experiences reveal assumptions and foster understanding. Over time, Shared Mental Models align more closely, and trust builds across organizational boundaries. Consequently, a common language slowly develops.

Shared Language and Shared Meaning

One of the hidden challenges of merger integration is that different groups often use the same words to mean different things.

Terms such as:

• customer,
• quality,
• urgency,
• innovation,
• risk,
• compliance,
• and service

may carry very different meanings, in specific contexts, across organisational cultures.

Socialisation helps people move beyond vocabulary toward shared meaning.

This is often a critical step in creating a coherent organisation.

Nahavandi and Malekzadeh (Nahavandi, 1988) describe mergers as an acculturation process in which organisations must adapt to one another’s beliefs, assumptions, and practices. Successful integration, therefore, requires more than structural alignment; it requires the development of shared understanding.

Building Bridging Trust

Healthy organisations require both local trust and bridging trust.

• Local trust enables teams to function effectively.
• Bridging trust enables learning, knowledge sharing, coordination, and adaptation across organisational boundaries.

Without bridging trust, organisations risk developing disconnected Trust Islands that gradually evolve into silos.

Final Thought

Successful merger integration is not simply about integrating systems. It is about integrating meaning.

Through Socialisation in Gemba, people gain exposure to one another’s realities, assumptions, and stories.

As Shared Mental Models expand and bridging trust develops, a new organisational identity can emerge. Research on post-merger integration increasingly emphasises that participation, communication, identity formation, learning, and human relationships are central to successful integration outcomes (Sarala et al., 2019).

The goal is not merely to combine organisations. It is to create a single organisation capable of learning, coordinating, and adapting together.

 

 

Cilliers, F., & Greyvenstein, H. (2012). The impact of silo mentality on team identity: An organisational case study. SA Journal of Industrial Psychology, 38(2), 1-9.

Leroy, F., & Ramanantsoa, B. . (1997). The cognitive and behavioural dimensions of organizational learning in a merger: An empirical study. . Journal of Management Studies, 34(6), 871-894.

Nahavandi, A., & Malekzadeh, A. R. (1988). Acculturation in mergers and acquisitions. Academy of management review, 13(1), 79-90.

Nonaka, I., & Takeuchi, H. (2007). The knowledge-creating company. Harvard business review, 85(7/8), 162.

Sarala, R. M., Vaara, E., & Junni, P. . (2019). Beyond merger syndrome and cultural differences: New avenues for research on the “human side” of global mergers and acquisitions. Journal of World Business,, 54(4), 307-321.