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it also needs to be accelerated and supported by structures and accountability arrangements , and by the commitment of politicians
mae angen eu cyflymu hefyd a'u hategu gan strwythurau a threfniadau atebolrwydd , a chan ymrwymiad gwleidyddion
however , it would be wrong to assume that these views are conclusive , or particularly well developed and supported by much published research
fodd bynnag , byddai'n amhriodol tybio bod y farn hon yn ddiymwad , neu yn bendant iawn ac wedi ei hategu gan doreth o ymchwil gyhoeddedig
although buses are regularly tested for fitness and drivers must be licensed , on occasion , standards can drop
er y caiff bysiau eu profi'n rheolaidd er mwyn sicrhau eu bod yn addas ac er bod angen i yrwyr gael trwydded , gall safonau ostwng ar adegau