Assign leaders to each workstream
There are different ways to structure workstreams, depending on the size and complexity of the business and integration (e.g., executive-level sponsors plus workstream owners, workstream co-owners from both the acquirer and the target), but fundamentally a leader must be responsible for the creation of the plans and the execution of the work across each workstream.
Generally speaking, executives tend to make poor workstream leaders. The workstream leader must be tactical and willing to dig into the details of activities and decisions. On the other hand, mid-to-senior-level executives (L2 and below) usually have sufficiently detailed knowledge of the operations of a given function or workstream and are still able to connect decisions to the overall deal thesis and strategy of the transaction. However, sometimes another layer of workstream oversight is desirable. In such instances, a set of executive sponsors can be appointed to sit above the workstream leaders and provide additional guidance to the workstreams, while also helping ensure there is senior-level buy-in on decisions.
Another option for workstream leadership is to appoint co-leaders from both the acquirer and the target. This approach can be effective, but there are some inherent risks and challenges. On the positive side, having two workstream leaders can generate greater buy-in for the integration program. It also signals to employees the importance of both legacy organizations in decision-making for the new company. However, having co-leaders can create confusion over the ownership of the workstream. IMO leaders lose the “one throat to choke” accountability for the workstream. Furthermore, if there is tension between the co-leaders due to competition for longer-term management positions, infighting or friction can delay progress.