After the Deal: Planning and Designing the Merger Integration Journey

In Part 1 of our series, we explored the strategic groundwork necessary to set your merger integration on the right trajectory—from crafting a clear strategy to assembling the right leadership structures.

Now, in Part 2, we shift our focus to the planning and design phase, where vision begins to take shape through actionable methods.

Go beyond strategy and frameworks — with program-level methods that translate strategy into detailed plans, timelines, and cross-functional coordination to guide teams through the complexities of integration. In this post, we’ll share essential activities, colorful commentary from real-world integrations, and practical advice to help you design a merger integration roadmap that’s both resilient and responsive.

Preparing the Launch Event

The merger lifecycle is made up of phases that are distinct yet overlapping. For example, as the deal’s sign & close efforts are finalized, the integration team already started activating their workstreams. While these are two separate tracks of work, their co-scheduling dependency is important. Pragmatically, the signing phase is an indicator this deal is truly going to happen and gives the greater integration team the confidence required to get going.

Seasoned integration leaders also have embedded signals enabling the mental, emotional and programmatic separation between phases. Organizing the Launch Event is one such signal. Actually, it is more than a signal. This type of event, which significant organizational activity, sets the coordination of a newly united organization in motion.

Organizing and setting the date for a merger integration launch event doesn’t have to be overly complicated as one may imagine. Certainly, coordinating everyone’s calendar will be challenging. However, setting a reminder to tackle this task at the mid-point of the sign & close phase can make scheduling simpler.

A more challenging, yet more fulfilling, part of the launch event process is building the presentation. A launch presentation can make or break what happens in the first 100 days of a merger integration journey. Therefore, it must be well-designed and well-practiced.

Here is a sample set of activities and tasks we use in our professional project plans that lays out how to run a Launch Event process:

1. Launch Event Preparation
   • Build strong relationships with your governance team
     • Bring the team together especially when they come from different orgs, cultures, and geographies
     • Establish norms that everyone can agree on
   • Build the launch deck
     • Find and repurpose a marketing template
     • Acquire a new (albeit draft) logo, if applicable
     • Transpose the business case
     • Define the North Star
     • Transpose the key milestones
     • Transpose OKRs
     • Ensure the member-value attainment doctrine and critical path
     • Include the operating culture
     • Include roles, responsibilities and expectations
     • Include risk and issue education
     • Include the key action items and next steps
   • Assign speakers
     • Select 2-3 primary speakers
     • Communicate expectations with the speakers
     • Ensure speaker buy-in and feedback on the Launch deck
2. Launch Event Scheduling
   • Schedule the dry-runs and technical test sessions
   • Schedule the actual launch event
3. Launch Event Execution
   • Run the dry-runs and technical test sessions
   • Run the launch event
4. Post-Launch Follow-ups
   • Schedule the recurring check-ins with the governance managers
   • Schedule the readouts to key decision makers

Preparing Functional Workstreams for Integration

Preparing functional workstreams for merger integration success begins with intentional alignment—both structurally and culturally. Each workstream, whether HR, Finance, IT, or Operations, must be anchored to the broader integration strategy and guided by a clear set of priorities. This means early identification of functional leads who not only understand their domain but can also navigate their organization, along with ambiguity and cross-functional dependencies. These leads should be engaged during the due diligence phase, when feasible, and certainly during the integration planning phase, not just when the deal closes, to ensure they have the context and authority to make decisions that will shape the integration’s trajectory. A common misstep is assuming that functional teams will “figure it out” once the deal is done. In reality, without early engagement and structured planning, workstreams risk operating in silos, leading to misaligned timelines, duplicated efforts, and missed synergies.

Each workstream must develop a tailored integration plan that includes key milestones, risk assessments, and escalation protocols. These plans should be reviewed and refined in collaboration with the Integration Management Office to ensure consistency and interdependency mapping. In fact, this is often a good opportunity to conduct a “Dependency Mapping Workshop” to allow all workstream leaders to review other workstream leaders’ plans and discuss interdependencies between teams.

For example, the Finance plan may include a milestone to consolidate reporting systems, but if IT doesn’t have a milestone reflecting alignment with the data architecture, this effort would stall. An interactive workshop would likely identify this dependency, hence the importance of sequencing milestones.

Functional leads should also identify “quick wins” that build momentum and demonstrate progress—such as harmonizing employee benefits or streamlining vendor contracts. These wins not only boost morale but also reinforce the value of integration. Regular check-ins, scenario planning, and transparent communication in coordination with the Integration Management Office are essential to keep workstreams agile and responsive to emerging challenges. Ultimately, success hinges on the ability of each functional team to operate with clarity, coordination, and a shared commitment to the integration’s North Star.

Building a Day One Playbook

Crafting a Day One Playbook is about more than just logistics—it’s about orchestrating a seamless transition that reflects the strategic intent of the merger. The playbook should be a tightly coordinated guide that outlines the critical actions, communications, and operational shifts that must occur on the first day the organizations begin functioning as one entity. This includes everything from system access and organizational announcements to customer-facing updates and regulatory disclosures. The goal is to eliminate ambiguity and ensure that every stakeholder—from employees to external partners to clients—experiences clarity, confidence, and continuity. A well-structured playbook acts as a choreography of readiness, where each move is deliberate and aligned with the integration’s North Star.

To build this playbook, integration leaders must engage cross-functional workstreams early to identify dependencies and define success metrics for Day One. For example, HR must be ready to communicate new reporting lines and benefits harmonization, while IT ensures that systems access and credentials are live and secure. Finance should be prepared to execute consolidated reporting, and Operations must have contingency plans for any service disruptions. These activities should be sequenced with precision, and each workstream must have a clear escalation protocol to address unexpected issues. The playbook should also include a communications cascade—who says what, to whom, and when—ensuring that messaging is consistent, empathetic, and aligned with the merger’s strategic narrative. Ultimately, the Day One Playbook is a declaration of readiness and a signal that the integration is moving from vision to execution.

For samples of playbooks, please reach out to Darren and John at their contact information below.

Addressing Compliance and Legal

The deal team is likely quite ready to hand off all compliance and legal items to the integration team as the ink dries at signing. Notably, in credit union-related transactions, ensure your Executive Team and Board are fully aware of the completed or unfinished items on our Legal Day 1 checklist. Legal and compliance activities aren’t just a checkbox—they are a strategic safeguard.

Here are the minimum items to consider and plan to address:

• Regulatory filings and approvals
• Contract reviews and renegotiations
• Change of mission or charter
• Employment law compliance
• Data protection and cybersecurity obligations
• Federal and State identification numbers

Avoid delays and costly setbacks by planning ahead for compliance and legal matters. While there are certain aspects that may not be in your control, ensuring you take control of what you can to mitigate compliance and legal issues will help protect merger value, a core deliverable of your program.

Laying Down Risk Plans

Early in my career, a mentor liked to start with a parable whenever we met. Here is a reminder from The Bridge Builders.

The lesson? Planning for risk doesn’t slow you down—it keeps you standing when the unexpected hits. Therefore, having your risk and issue process in place is less about contemplating failure and more about planning for uninterrupted operations.

Your risk plan is a structured approach to identifying, assessing, and mitigating potential threats that could derail the integration process. These risks can span financial, operational, member/customer, legal, cultural, and technological domains. The goal is to anticipate challenges before they arise and have a clear response strategy in place.

Risk plans come in a variety of flavors. There is no doubt your Chief Risk Officer already has a few standard templates, which could be leveraged through a simple conversation. Feel free to reach out to your CRO for a conversation to leverage what is already a corporate standard. And while you’re at it, ask about the approved tools or apps for logging risks.

Bridging the Gap Between Strategy and Execution Through Transition Support

Transition Support in post-merger integration refers to the structured assistance provided to employees, members/customers, and operational teams as they navigate the shift from two separate entities to one unified organization. It’s the scaffolding that holds the integration together during the most vulnerable phase—when systems are changing, roles are evolving, and uncertainty is high. Effective Transition Support ensures that business continuity is maintained, cultural alignment is nurtured, and people feel equipped to operate in the new environment. It’s not just about answering questions—it’s about anticipating needs, reducing friction, and reinforcing confidence.

Planning for Transition Support begins well before Day One. Integration leaders should identify high-impact areas where disruption is most likely—such as IT systems, HR processes, member/customer service, and supply chain operations—and build tailored support mechanisms around them. This might include dedicated transition teams, real-time help desks, onboarding toolkits, and pulse surveys to monitor sentiment. Communication plays a central role: support channels must be clearly defined, accessible, and responsive. Additionally, leaders should empower frontline managers with talking points, escalation paths, and decision-making authority to resolve issues quickly. Transition Support isn’t a one-time effort—it’s a sustained commitment that evolves as the integration matures, ensuring that the organization doesn’t just survive the transition, but thrives through it.

Part 3 – Coming Soon

In the final chapter of this series, which will be available before the holidays, we’ll be sharing our top three planning and design practices along with actual templates and samples for your next transaction. Circulating real-world knowledge regarding what’s gone well and what hasn’t creates a strong community of merger integration practitioners. The cost of failure is simply too high and learning from others accelerates success.

Share your story by contacting us via email below or connecting via LinkedIn. We look forward to welcoming you into our Merger Integration community.

Learn more about Forvis Mazars’ Post-merger integration team at https://www.forvismazars.com/group/en/services/financial-advisory/deals/post-merger-integration

Want to discuss your credit union’s post-merger integration in more detail? Contact ALM First’s team of experts to learn more.