Doubled haploid (DH) technology is increasingly utilized in maize breeding for achieving rapid genetic gains and speeding up product development. Several maize breeding programs within public institutions and small and medium private enterprises, especially in tropical maize growing countries, lag behind in using this technology. By disseminating newly developed tropical inducer lines, offering technical know-how to breeding programs, and conducting training courses, CIMMYT has been working to close this gap. CIMMYT also produced an elaborate training manual on DH technology (available for download at CIMMYT library repository).