Mcmahon and Patton (2002) make the point that although the profile of qualitative assessment in career counselling has been raised, as opposed to the more usual quantitative assessment, there is little to guide the use of qualitative assessment. Their paper presents a theoretical overview of qualitative assessment in career counselling and proposes guidelines for using qualitative assessment.

Mary Mcmahon.,  Wendy Patton Using Qualitative Assessment in Career Counselling International Journal for Educational and Vocational Guidance 2 (1): 51-66, 2002

In the field of vocational psychology and career development, Savickas (2001) emphasises the relevance of  Donald E Super`s hypotheses in reminding us that the individual differences view of occupations and workers ignores the longitudinal vantage point from which one can observe how individuals expand their vocational coping repertoires and develop their careers. Savickas argues that Super`s important hypotheses and models about career maturity, salience, stages, patterns, and themes, remain as valuable today as when he first introduced them in the 1950s.

Mark L. Savickas, A Developmental Perspective on Vocational Behaviour: Career Patterns, Salience, and Themes, International Journal for Educational and Vocational Guidance 1 (1-2): 49-57, 2001.

Peterson and Gonzalez (2000), have edited a case book of 22 essays that apply theory to individual cases, showing how a particular client's background, needs, and options guide the direction of successful career guidance intervention. The book describes a variety of career and vocational guidance models that can be used for diverse populations of all ages.

Peterson, N. & Cortez Gonzalez, Career Counseling Models for Diverse Populations: Hands-on Applications for Practitioners (2000)

Other valuable sources that link theory and practice include: Sampson et al (2004) who focus upon the cognitive information processing (CIP) approach to career problem solving and decision-making; and Spencer G. Niles (2002) who has edited a presentation of cutting edge theories and interventions pertaining to adult career development.