[4][5] The inclusion of compliments slips in responses to such routine requests is often seen by businesses as a necessary step in maintaining good public relations.
[3] Eric Bain recommends that they be of a size suitable for placing inside an envelope without more than one fold, and large enough to be noticed when included in a parcel.
[6] Miller recommends size A5 for stationery that doubles up as both compliments slip and headed letter paper.
[8] Since they are informal, compliments slips are not substitutes in those cases where a formal letter is required for legal reasons.
[10] Hailey recommends an alternative strategy for providing a personal touch: removing the salutation from compliments slips, thus forcing the entire note to be hand-written.