See REGIONAL STUDY ON INFORMAL EMPLOYMENT STATISTICS TO SUPPORT DECENT WORK PROMOTION IN ASEAN for full report

As of yet, there is no official measure of the size of informal employment for ASEAN as a whole. For the purpose of the database, informal employment is defined using the official operational definition of the country (see Chapter 4 of the Regional Study on Informal Employment Statistics to Support Decent Work Promotion in ASEAN for individual country definitions); (b) contribution to informal employment for a subgroup is defined as the number of informally employed in the subgroup divided by the total number of informally employed in the country (e.g., contribution of urban areas to informal employment = urban informally employed/Total informally employed; (c) In the case of Malaysia, informal employment is counted only for those in the informal sector and includes only workers up to 64 years of age, so figures for Malaysia are not straightforwardly comparable to those in other countries