David's Battery Of Differential Abilities | DBDA |

The revised version of DBDA aims to tap an individual’s various mental abilities accurately ...
It employs a standardized procedure to measure one’s ability at a given point under specific conditions objectively.
It is meant for 14 + and takes 1 hour to administer
There are eight sub-tests which are discussed ahead
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.
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
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 & electrical principles,
8. Psychomotor Ability (PM)- Refers to precise movements requiring eye hand coordination and also fine muscle dexterity,