This is the product's core value and its hardest design problem. The calculator handles dozens of interdependent inputs - income for child support purposes, prior court-ordered obligations, custody overnight splits, healthcare costs, extraordinary expenses - grouped into clear sections (General Information, Calculation Details, Maintenance Adjustments) so an attorney can work through it top-to-bottom without losing their place. Inline help icons clarify legally specific terms without forcing users to leave the form, and a persistent, clear validation message ("The form is not valid") prevents attorneys from exporting or relying on an incomplete calculation. Compare and Export actions let the output feed directly into case documentation.