Only apply the given CONCEPT to the given part. I.e., EN: 20

Also possible, but rarely used: Fifthly, Sixthly, Seventhly (e.g., Seventhly Twisted Eight Chain Thru). There are very few calls that have more than 4 parts. EN: 30

Do the call but when you reach the given part, re-evaluate and apply the given CONCEPT to the given part, then re-evaluate your position in the resulting formation and do the remainder of the call. EN: 40

Secondly | Thirdly | Fourthly are Meta Concepts. A Meta Concept applies to another concept, not a call. The caller can not say Secondly anything where anything is just a call. The caller must give a concept after the word Secondly. EN: 50

Sometimes, the given concept may not "feel" like a concept. E.g., Secondly Boys, or Thirdly Twice. For the purposes of Secondly|Thirdly|Fourthly, anything that modifies the call is considered a concept. This includes identifiers (e.g., Boys, Girls, Ends, Centers, Leaders, Trailers, Beaus, Belles, Heads, Sides); formations (e.g., Triple Box); numerics (e.g., twice, 1 & 1/2, 2/3); and other modifiers (e.g., Transfer And, Tally Ho But). EN: 60

It is important to re-evaluate your position both before and immediately after the given part as, depending upon the given concept, you may unexpectedly be working with different dancers or in a different formation. EN: 70