This book investigates the fundamental operational techniques required to maximize the utility of early electronic pocket calculators. Henry Mullish, a computer scientist and educator, provides a structured framework for users to transition from basic arithmetic to more complex mathematical functions. The text serves as a technical manual designed to demystify the logic behind calculator key sequences and functional limitations.

Readers frequently note the clarity of the instructional steps provided for early calculator models. Experts highlight this as a foundational text for users transitioning from slide rules to electronic computation.