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Why Excel review becomes the bottleneck
A single engagement workbook can combine a trial balance extract, inventory detail, VAT schedules, management reporting and presentation tabs. It may contain dozens of sheets, hidden rows or columns, formula-heavy summaries, raw-data regions and report regions with different logic. Headings can change between periods or be repeated in several places. A reviewer needs to know what is a source record, what is a calculated schedule and what is merely a presentation view before relying on any movement or conclusion.