Increases in scope from new developments were likely to continue, and it may be necessary to use cost ranges in business case preparation, rather than single estimates.
Roedd cynnydd mewn cwmpas o ganlyniad i ddatblygiadau newydd yn debygol o barhau, ac efallai y bydd angen defnyddio ystodau cost wrth baratoi achosion busnes, yn hytrach nag amcangyfrifon unigol.