Programme Duration
18 Months
Delivery Locations
3 Cities
Legacy Organisations
2 Cultures
Behaviour Shift
L3 Evidenced
Cohort
Managers across legacy and acquired organisations
Scale
3 cities, 2 legacy cultures
Methodology
LEAP, ExperienceLearning, Culture Integration
Duration
18 months
The problem before ProventusHR
Post-acquisition integration almost always underestimates culture. The process excellence, the technology stack, the client portfolio, the revenue synergies , these are mappable and manageable. What is not mappable in a due diligence process is the set of invisible norms, habits, and loyalties that constitute how work actually gets done in an organisation. Legacy company A had a strong senior leadership culture with high centralisation and low delegation. Legacy company B had been built on significant managerial autonomy and a strong project-team identity. When these two operating models encountered each other in the combined entity, the friction was not visible in any management information system. It was visible in the quality of decisions, in the speed of execution, and in the attrition of the managers from the acquired organisation, who experienced the integration as a quiet absorption rather than a genuine combination.
What the diagnostic surfaced
ProventusHR conducted discovery conversations with thirty managers drawn equally from both legacy organisations and with the CHRO and three HR business partners. The picture that emerged was consistent: the combined organisation had one stated culture and two operational cultures. The managers from the acquired company had developed a set of accommodation behaviours , they were performing integration while privately maintaining the norms of their previous organisation. The managers from the acquiring company were doing something equally unhelpful: assuming that integration meant adoption of their practices, and interpreting the accommodation behaviours of their peers as evidence of cultural alignment.
LEAP was designed in a single combined cohort per city, drawing managers from both legacy organisations into the same learning experience. This was itself a design decision: segregating the cohorts by legacy organisation would have reinforced exactly what needed to be dissolved. The first module used a floor simulation that made the two operating models visible by constructing a scenario that required teams to work across both. The debrief produced the first honest conversation in many cohorts about what the two cultures actually were and what the combined culture might aspire to be. Subsequent modules built a shared leadership language, a common approach to delegation and accountability, and specific behavioural commitments that participants made across organisational lines. Application experiments required participants to practice new behaviours with a manager from the other legacy organisation as their accountability partner.
Delivery across three cities over eighteen months produced a consistent pattern: the most significant shifts occurred in cohorts where the legacy balance was approximately equal. In cohorts where one legacy organisation dominated numerically, the dynamics of the minority group required more active facilitation management. The cross-legacy accountability partnerships were the single most impactful design element. By module three, several partnerships had produced working relationships that participants described as qualitatively different from anything they had managed to build in the preceding year.
At 90-day follow-up, manager-rated collaboration scores across legacy lines showed significant improvement across all three cohorts. Attrition among managers from the acquired organisation, which had been running at concerning levels in the six months before the programme, reduced by more than half in the cohort populations in the twelve months following programme completion. Three cross-legacy teams that included programme participants were nominated for internal performance awards in the year following the programme. The CHRO reported that the most visible evidence of impact was a change in the physical arrangement of meeting rooms , legacy organisation clustering had largely disappeared.
Post-acquisition culture integration fails when it is treated as communication. Telling people they are now one organisation does not make them one organisation. What makes them one organisation is a shared experience of navigating something difficult together, discovering in the process that the people from the other side of the acquisition have something worth respecting, and building the relational infrastructure that allows that discovery to accumulate into a genuine shared identity.
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