<prompt> Translate the following text to SwahiliThey are suitable for use only when uncertainties involved in contract performance, such as research and development work, do not permit costs to be estimated with sufficient accuracy.  <response>: Ni sahihi kwa ajili ya matumizi tu wakati uncertainties kuhusishwa katika utendaji wa mkataba, kama vile utafiti na maendeleo ya kazi, kuruhusu gharama ya kukadiria na usahihi wa kutosha. 