Claim: Virginia Henderson was co-author of the fifth (1955) and sixth (1978) editions and she developed one of the major nursing theories (a creative and rigorous structuring of ideas that project a tentative, purposeful, and systematic view of phenomena).
Evidence: She was co-author of the fifth (1955) and sixth (1978) editions. She developed one of the major nursing theories. Nursing theory is defined as "a creative and rigorous structuring of ideas that project a tentative, purposeful, and systematic view of phenomena".