Form fields -- including text fields, check boxes, radio buttons -- can be used to create fillable/interactive PDF e-forms and checklists and are particularly useful to retrieve input automatically. Form fields are also often beneficial in large documents that are typically authored in FrameMaker, for example manuals or workbooks.
Adding form fields manually after creation of the PDF is labor-intensive, and all work invested will have to be repeated every time the source documents are updated.
Using FrameMaker-to-Acrobat TimeSavers & Form Assistant, you can take advantage of all of FrameMaker capabilities (such as layout, numbering, conditional text, cross-reference, text insets and variables) to author documents that, upon conversion to PDF, will automatically contain text fields, check boxes, radio buttons and additional form controls.
Creating a PDF that uses form fields does not mean that the document is designed purely for on-screen use. The same document can serve both for print and online purposes, designed to have a different output depending on use. For example, printed lines for quiz answers can replace the fields used for on-screen interaction such as data entry and selection.