Body and sleeves are worked in the round from lower edge to underarms, then joined to work the yoke in the round.
Cardigan: round begins and ends with a purled st for the steek at front of body. Use a sewing machine to sew over the purl sts in the front middle before cutting the front opening.
Sweater: round begins at left side of body. On yoke, round begins on left side of body back where body joins sleeve.