Understanding human motivation requires gauging individuals' strivings to be effective in controlling goal pursuits and establishing the truth about themselves and their experiences. Two constructs, assessment and locomotion, capture well truth and control strivings, respectively. The validation process of the instruments measuring assessment and locomotion involved university students and army personnel. As a result, it is currently unknown whether these instruments offer reliable and valid measurements of the constructs for younger respondents. To bridge this important gap, this study used data from two independent large samples of secondary school students. Findings show that slight modifications of the original locomotion scale made it appropriate for use with this population. Although the assessment instrument required more alterations, the changes needed are simple, straightforward to implement, and unlikely to affect significantly the conceptual breadth of the measured construct.