Technology diligence does not need to answer every integration question before a deal closes. But it does need to surface the risks that could change valuation, timing, cost, security posture, or integration strategy.
A one-week diligence pass should focus on finding the unknowns that matter. The objective is not perfection. The objective is to avoid being surprised after signing. This is core technology advisory work.
Day 1: Build the system map
Start by identifying the systems that run the business. At minimum, capture: ERP or rental management system, accounting and finance systems, CRM or sales tools, dispatch and logistics, inventory or fleet systems, telematics, HR and payroll, email and productivity, file storage, phone system, BI tools, custom applications, and third-party integrations.
For each system, document owner, vendor, contract status, number of users, criticality, data exports, integrations, and known issues. The key question: what systems must be integrated, replaced, retired, or left alone?
Day 2: Review infrastructure and branch technology
Next, understand how the business actually operates. Look at number of locations, network design, internet providers, firewalls and VPNs, servers and hosting, cloud environments, endpoint management, printers/scanners/payment devices/phones, backup and disaster recovery, local branch dependencies, aging hardware, and unsupported systems.
Flag anything that will slow integration: local servers with no documentation, branch-specific systems, old operating systems, weak backup, unmanaged devices, or undocumented network changes.
Day 3: Check identity and security
Identity and security and compliance can create immediate post-close risk. Review user directories, admin accounts, multifactor authentication, password policies, shared accounts, remote access, endpoint protection, email security, logging and monitoring, cyber insurance requirements, security incidents, vulnerability management, third-party access, and compliance obligations.
Patterns to flag immediately: no MFA for remote access or email, shared admin accounts, unknown local administrators, unsupported systems exposed to the internet, no reliable endpoint inventory, no recent backup restore test, no clear offboarding process.
Day 4: Understand the data
Data quality determines integration complexity. Review customer master, vendor master, asset/fleet master, chart of accounts, open invoices, contracts, inventory, pricing/rate tables, historical transactions, reporting definitions, and duplicates or naming inconsistencies.
Ask whether the data can be exported cleanly and whether the target business uses the same definitions as the buyer. The biggest issue is often not missing data. It is mismatched meaning.
Day 5: Review vendors and contracts
Vendor contracts can limit integration options. Capture software contracts, hosting agreements, telecom contracts, equipment leases, support agreements, data ownership terms, termination clauses, assignment/change-of-control clauses, renewal dates, minimum commitments, pricing increases, and service-level obligations. This is where hidden costs often appear.
Day 6: Estimate integration complexity
Build a simple integration risk matrix. For each major area, score business criticality, technical complexity, data complexity, security risk, vendor dependency, cost exposure, and timeline impact.
Then group findings into:
- Must know before signing
- Must fix before close
- Must fix in first 30 days
- Integration planning item
- Longer-term modernization item
Day 7: Deliver the executive readout
The final diligence output should be short and decision-oriented. Include top 10 technology risks, estimated integration cost range, immediate security concerns, systems likely to keep/replace/integrate, contracts requiring attention, data migration concerns, day-one readiness issues, and 30/60/90-day integration priorities.
The best diligence readout is not a giant spreadsheet. It is a clear view of what could affect the deal. A sound enterprise architecture view of the target is what turns findings into a plan.
The practical rule
In one week, you are not trying to solve integration. You are trying to expose the risks that affect negotiation, closing, and the first 100 days.