Approximate methods for assessing impact have the
virtue of requiring less technical knowledge and time, and
usually are low in cost. Typically they are based on slim data and
usually there are no opportunities to rule out contaminating influences that may account for part of the gross effects.
Approximate methods are recommended only in selected cases
where more robust approaches cannot be applied for reasons of
either time or resources.
Questia, a part of Gale, Cengage Learning. www.questia.com
Book title: Evaluation:A Systematic Approach.
Contributors: Peter H. Rossi - Author, Howard E. Freeman - Author, Sonia R. Wright - Author.
Place of publication: Beverly Hills, CA.
Publication year: 1979.
Page number: 225.
This material is protected by copyright and, with the exception of fair use, may
not be further copied, distributed or transmitted in any form or by any means.