Scoring (from parts)
Transcribing individual parts into a full score.
What it means
Scoring from parts means transcribing individual parts, as handed out to individual musicians, into a combined full score in which all parts appear stacked on separate staves.
The term corresponds to the Italian "spartire" ("to set in score"); the result, the score, is called "spartito" in Italian.
Musical use
Historically, scoring from parts was necessary when only the individual parts of a work survived, as with many works of the Renaissance and early Baroque, and one wanted to reconstruct an overview from them to study, analyze, or perform the work.
As an exercise in music theory, scoring from parts also served to understand precisely how the parts interact, similar to the reverse process of extracting parts from a score.
Scoring from parts should be distinguished from a piano reduction, in which an orchestral score is reduced to one or two staves for piano, whereas scoring from parts involves no reduction, only a combination of already existing individual parts.
Performance practice
If you score from parts yourself, arrange the parts in their usual order on the system and make sure the bar numbering matches. Check the result once more against the individual parts to rule out transcription errors.