Start with the decisions
Identify the weekly decisions the report should support: which channels need investigation, where the journey breaks and how lead quality changes.
Define sessions, lead events and qualified leads separately. Record the source system and reporting delay for each measure.
Validate before visualising
Test event triggers against successful and unsuccessful actions, including repeat interactions. Check that campaign parameters survive the relevant journey.
Reconcile a controlled sample against source records. Investigate differences before combining tools in one dashboard.
Build a useful review
Place acquisition, enquiry volume and qualification context in a consistent reporting window. Keep channel definitions visible to the reader.
Agree a regular review of missing source values, duplicate events and unexpected channel changes. Give each data-quality issue an owner and record any definition changes before comparing periods.