on_paper
1. [ adverb ] as written or printed
Synonyms: in_writing
Examples:

"this is exactly what the composer had set down on paper"

2. [ adverb ] as described in contrast to as practiced
Synonyms: in_theory
Examples:

"on paper, this looks like a good idea"

3. [ adverb ] according to the assumed facts
Synonyms: in_theory theoretically
Examples:

"on paper the candidate seems promising"