Common Cause V. Schmitt (1981)

These memos inform the Court whether a justice is "out" for a case; the memo may ask the opinion author to note the justice took no part in consideration of a case; memos may inform the Court that a justice is participating (e.g., not out; not recuse); memos may concern whether a justice should recuse himself or herself (e.g., may recuse self; have not decided whether to participate; do not think I should recuse); memos written by other justices about a colleague's recusal

Justice makes a suggestion or lays out position in the case before the majority opinion is circulated; discussion of issues before an opinion has been drafted; memo laying out other justice's position or describing how other justices’ have voted so far in the case; lays out position without directing it at a circulating opinion

This refers to a draft per curiam opinion