One criterion of a student's success in school is regular and punctual attendance. Frequent absences and chronic absenteeism may lead to poor academic work, lack of social development and possible academic failure. Regular attendance is of utmost importance for school interest, social adjustment and scholastic achievement. No single factor may interfere with a student's progress more quickly than frequent tardiness or absence. Continuity in the learning process and social adaptation is seriously disrupted by excessive absences. In most situations, the work missed cannot be made up adequately. Students who have good attendance generally achieve higher grades, enjoy school more and are more employable after leaving school. According to the Colorado Compulsory Attendance Law, it is the obligation of every parent/guardian to ensure that every child under his or her care and supervision receives adequate education and training and, if of compulsory attendance age, attends school. It is the obligation of every parent/guardian to notify school officials of changes in phone numbers, addresses and contact information as soon as possible. C.R.S. 22-33-104 states: (1) (a) ...every child who has attained the age of six years on or before August 1 of each year and is under the age of seventeen years, except as provided by this section, shall attend public school for at least the following number of hours during each school year: (I) One thousand fifty-six hours if a secondary school pupil; (II) Nine hundred sixty-eight hours if an elementary school pupil in a grade other than kindergarten; (III) Nine hundred hours if a full-day kindergarten pupil; or (IV) Four hundred fifty hours if a half-day kindergarten pupil.