Book excerpt: This book develops an original theory of the search for space objects, on which only crude orbital information is known. It uses a special principle to construct a plan for searching for such objects through optical or radar sensors. This principle maximally eliminates the loss of the sought-for object and provides an economical use of the resources used in the search. This book will be of great interest for astronomers-observers, space control services, space researchers, and students at technical universities.