DBDA Introduction

Davis’ Battery of Differential Abilities

Aptitude is the implication of innateness now referred as the fact of the individual that can be brought about by a specified amount of training to a specified level of ability, either general or special. Aptitude is defined as “a condition or a set of characteristics regarded as symptomatic of an individual’s ability to acquire with training some (usually specified) Knowledge, skill or set of responses such as the ability to speak a language, to produce music.” (Bennett, Seashore, & Wesman, 1982) The application of factor analytic studies of mental abilities has led to the increasing use of multi-aptitude test batteries in educational and vocational guidance. These batteries are composed of a series of individual tests built around the premise of factor analysis. One such battery is the Differential Aptitude Test. The Differential Aptitude Test or DAT were first published in 1947 and has been subject to three major revisions since first constructed. The test was originally developed to provide a well standardized procedure for measuring the multiple aptitudes of students in grades 8 through 12 for purposes of educational and vocational guidance. Description of the test Davis’ Battery of Differential Abilities (DBDA) has been revised in order to have an accurate measure of individuals various mental abilities. The DBDA (revised version) is a standardized procedure for objectively measuring what a person is able to do a at the time he is being assessed and under the conditions of the assessment. It has a high predictive validity but the predictability may not be the same because abilities are the product of nature as well as nurture as mental functioning will be influenced by extrinsic factors

such as cultural exposures including quality of education and personality factors. The different abilities are measured using different sub tests that are administered one after the other. Each of these sub tests are timed and the timings have to be maintained strictly. Time is disclosed for all the tests except for Spatial Ability and Clerical Ability. The abilities that are measured in DBDA- (R) are: 1. Verbal Ability (VA)- Refers to the comprehension of words and ideas, or a person’s ability to understand written language. 2. Numerical Ability (NA)- It refers to facility in manipulating numbers quickly and accurately in tasks involving mathematical knowledge. 3. Spatial Ability (SA)- Refers to perceived spatial patterns accurately, and following the orientation of figures when their positions in a plane or space is altered. 4. Closure Ability (CA)- It is an ability to see quickly a whole stimulus when parts of it are missing or incomplete. 5. Clerical Ability (CL) - Refers to a perceptual activity concerned with rapid evaluations of features of visual stimuli. 6. Reasoning Ability (RA)- Refers to the ability to apply the process of induction or to reason from some specific information to a general principle. 7. Mechanical Ability (MA)- Refers to an understanding of basic mechanical principles, simple machines, tools, electrical and automotive facts. 8. Psychomotor Ability (PM)- Refers to precise movements requiring eye hand coordination and also fine muscle dexterity, primarily manual under high speed conditions.

Scoring and Interpretation The stencil given is placed above the score sheet. The answers that are circled are the correct answers. The client gains, ‘1’ point for every correct answer. The scores are added in every category and then the Sten score is found out using the Sten score sheet. Generally a Sten score of 4, 5, 6 or 7 is indicative of an average level of ability. A Sten score of 1,2 or 3 is indicative of a lower level of ability. A score range from 8 to 10 indicates a high level of skills in the particular ability domain. An individual may have a higher ability in one domain, and not in the other. This helps to determine the aptitude in the particular area. Table 1.1 shows the categories along with the sten score and its interpretation. Categories

Sten

Interpretation

Verbal Ability

Score 1-3

Below average knowledge and understanding of words

4-7

and their use in day to day applications. Ability to understand and apply English language in an

8-10

unstructured form. Ability in comprehension and use of English words and

Numerical Ability 1-3

Spatial Ability

language. Extremely good vocabulary. Below average facility in handling numbers and their use

4-7

in day to day application. Average numerical ability showing fluency in

8-10

fundamental numerical operations. High ability to understand numerical operations rapidly

1-3

and accurately. Poor ability to perceive relationships and arrangement among visual patterns.

Closure Ability

Clerical Ability

4-7

Average ability to perceive spatial patterns clearly.

8-10

Extremely high ability to understand spatial relations and

1-3

grasp relationship among two-dimensional figures. Below average ability to perceive things in an organised

4-7

and meaningful manner. Average ability to form a perceptually organised

8-10

structure, from vague or jumbled data. Extremely high ability to understand and grasp

1-3

relationship among incomplete stimuli. Poor ability for perceptual activities involving rapid

4-7

evaluation of features of visual stimuli. Average ability to perform with speed and accuracy in a

8-10

monotonous task. Extremely high ability to work with rapid speed and accuracy in tasks which do not require higher level of

Reasoning Ability 1-3

Mechanical

intellectual activity. Below average ability to deduce or logically understand

4-7

the relationship between different concepts. Average ability to apply logical understanding from

8-10

specific concepts to general concepts. Extremely high ability to grasp the relationship between

1-3

the unknown stimuli. Poor understanding of basic mechanical principles

4-7

underlying simple machines. Average ability to understand the working of the basic

8-10

machines. Extremely high ability to understand the technical

Ability

aspects of different machines.

Psycho-motor

1-3

Below average eye hand coordination in high work speed

4-7

situations. Average ability in fine motor skills with respect to

8-10

manual tasks. Extremely high fine muscle dexterity in manual tasks.

Ability

Practical Applications of this battery 1. This battery is majorly used in Career counselling, to help the client to decide the most suitable career for himself based on the his level of ability. 2. It is majorly used by educators as well as students to help them understand the next steps of the educational options such as choosing a major course at college or university. 3. It is even used for appropriate selection of applicants for employment.

Bibliography Asthana, Bipin (2009). Measurement and Evaluation in Psychology and Education, Agra Agarwal Publications. Psychology Laboratory Workbook for III Year B.A/ B.Sc Paper I – Aptitude and ability tests (2005), Bangalore University, Psychometrics Publication : Bangalore.