<prompt> Translate the following text to SwahiliThe biggest challenge during the construction phase is managing changes resulting from such sources as scope of work changes by the owner, errors and omissions in the construction documents, and unknown or changed site conditions.  <response>: Changamoto kubwa wakati wa hatua ya ujenzi ni kusimamia mabadiliko yanayotokana na vyanzo kama vile mabadiliko ya wigo wa kazi na mmiliki, makosa na kutofautisha katika nyaraka za ujenzi, na hali zisizojulikana au zilizobadilika za tovuti. 