Cracks in concrete have many causes. They may affect appearance only, or may indicate significant structural distress or a lack of durability. Cracks may represent the total extent of the damage, or may point to problems of greater magnitude. Their significance depends on the type of structure and nature of the cracking. This is a review paper that proposes guidelines for crack evaluation and repair of concrete structures. The causes of cracks in concrete are examined along with the principal procedures used for crack control considering both plastic and hardened concrete. The paper presents the importance of design, detailing, construction procedures, concrete proportioning, and material properties. Relevant techniques and methodology for crack evaluation were identified and the need to determine the causes of cracks as a necessary prerequisite to repair is emphasized. The selection of successful repair techniques should consider the causes of cracking, while identifying active or dormant status, and the need for repair. Keywords: Cracks, Prevention, Remedies, Structure, Types of Cracks.