Improvement notice requires rectification of workplace contraventions and compliance reporting within 30 days. An improvement notice is issued after inspection of an establishment to record contraventions or irregularities under the OSH & WC Code, 2020 and allied rules, regulations, standards, notifications, and orders. The employer, principal employer, or contractor is directed to rectify the contraventions and submit a compliance report through the prescribed mode within 30 days from the date of issue, failing which action may be initiated under the relevant statutory provisions.