Two projects can look fully staffed on separate schedules while both depend on the same commissioning engineer. Each manager has a reasonable plan; the portfolio has an impossible one. The problem becomes visible only when resource commitments are considered together, usually at the moment when delay is already expensive.
See the actual dependency
A shared resource schedule should name the work that requires a particular specialist and the period in which that person is needed. Broad labels such as technical support conceal peaks. A few days of acceptance testing can determine the opening date of a facility even when the rest of the schedule has comfortable flexibility.
Allocate by consequence
Giving priority to the loudest project encourages escalation rather than good planning. A more useful comparison considers delay cost, readiness of supporting teams and whether an alternative specialist can perform the work. The project with the largest budget is not automatically the one where the scarce week creates the most value.
Buy capacity carefully
An external specialist may relieve the conflict, but onboarding and familiarity can consume the apparent saving. Conversely, protecting an internal expert from every external comparison can leave the group permanently constrained. The decision should examine the specific task, required knowledge and time available to transfer it, rather than treating outsourcing as a universal answer.
Make the trade visible
A sponsor can explain why one site receives priority and what support the other will get. That communication allows local managers to replan customer commitments and contractor attendance. Portfolio coordination earns its place when it turns a hidden double booking into a deliberate sequence that both operating companies can execute.
