NEW DELHI: The implementation of four labour codes in one go from April 1 next year will usher in a new wave of reforms in industrial relations and also help in attracting more investments but employment generation will remain a key challenge in 2021. This year has also been a challenging year for the work force as well as for employers due to the outbreak of the COVID-19 pandemic. The government imposed a nationwide lockdown from March 25, which had an adverse impact on economic activities and resulted in exodus of migrant workers from large cities to their homes in the hinterland. Many migrant labourers lost their jobs and it took months for them to return back to their work places from their native places.