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Web End = Adm Policy Ment Health (2015) 42:533544 DOI 10.1007/s10488-013-0528-y
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Web End = Purposeful Sampling for Qualitative Data Collection and Analysis in Mixed Method Implementation Research
Lawrence A. Palinkas Sarah M. Horwitz
Carla A. Green Jennifer P. Wisdom
Naihua Duan Kimberly Hoagwood
Published online: 6 November 2013 Springer Science+Business Media New York 2013
Abstract Purposeful sampling is widely used in qualitative research for the identication and selection of information-rich cases related to the phenomenon of interest. Although there are several different purposeful sampling strategies, criterion sampling appears to be used most commonly in implementation research. However, combining sampling strategies may be more appropriate to the aims of implementation research and more consistent with recent developments in quantitative methods. This paper reviews the principles and practice of purposeful sampling in implementation research, summarizes types and categories of purposeful sampling strategies and provides a set of recommendations for use of single strategy or multistage strategy designs, particularly for state implementation research.
Keywords Mental health services Children and
adolescents Mixed methods Qualitative methods
implementation State systems
Introduction
Recently there have been several calls for the use of mixed method designs in implementation research (Proctor et al. 2009; Landsverk et al. 2012; Palinkas et al. 2011a; Aarons et al. 2011). This has been precipitated by the realization that the challenges of implementing evidence-based and other innovative practices, treatments, interventions and programs are sufciently complex that a single methodological approach is often inadequate. This is particularly true of efforts to implement evidence-based practices (EBPs) in statewide systems where relationships among key stakeholders extend both vertically (from state to local organizations) and horizontally (between organizations located in different parts of a state). As in other areas of research, mixed method designs are viewed as preferable in implementation research because they provide a better understanding of research issues than either qualitative or quantitative approaches alone (Palinkas et al. 2011a, b, c). In such designs, qualitative methods are used to explore and obtain depth of understanding as to the reasons for success or failure to implement...