The Cessna 401 and 402 were developed to be non-pressurized twin-engine piston aircraft. Their goal was to be a workhorse, useful to cargo and small commuter airlines among other users.
The Cessna 401 and 402 were developments of the Cessna 411. One goal for the Cessna 401/402 was to improve upon the very bad single-engine handling of the Cessna 411. Another goal was to avoid using the somewhat expensive and maintenance prone geared engines of the Cessna 411.