R e s e a r c h a n d D e v e l o p m e n t (R&D) e v a l u a t i o n w i t h i n a g r i c u l t u r e is b e c o ming i n c r e a s i n g l y i m p o r t a n t as a p l a n n i n g tool in the r e s e a r c h m a n a g e m e n t p r o c e s s in eastern, central, a n d s o u t h e r n Africa. E v a l u a t i o n of a g r i c u l t u r a l r e s e a r c h in the r e g i o n is p e r f o r m e d at v a r i o u s levels for different p u r p o s e s . This article traces the e v o l u t i o n of R & D activities, a n d l o o k s at the c u r r e n t s t a t u s of the a g r i c u l t u r a l r e s e a r c h e v a l u a t i o n a n d the c a p a c i t y to u n d e r t a k e such e v a l u a t i o n s as a p a r t of r e s e a r c h m a n a g e m e n t --b o t h at the n a t i o n a l a n d r e g i o n a l levels. It critically e x a m i n e s the e x p e r i e n c e s of the r e g i o n in e v a l u a t i n g a g r i c u l t u r a l research a n d the efforts m a d e to p r o m o t e s u c h activities, s u m m a r i z i n g the l e s s o n s l e a r n e d . Finally, the article a n a l y z e s the critical c o n s t r a i n t s i m p e d i n g the successful a d o p t i o n of the a g r i c u l t u r a l research e v a l u a t i o n p r o c e s s a n d offers s u g g e s t i o n s , w h i c h c o u l d alleviate these c o n s t r a i n t s .