Hersey + Blanchard SLT conceptual foundation. ORIGIN: Paul Hersey + Ken Blanchard collaborative model first published 1969 in MANAGEMENT OF ORGANIZATIONAL BEHAVIOR (Prentice Hall) + originally called LIFE CYCLE THEORY OF LEADERSHIP + renamed SITUATIONAL LEADERSHIP THEORY (SLT) circa 1977; widely-cited foundational practitioner leadership model. CORE INSIGHT: no single leadership style is universally effective; effective leaders adapt their style to match the readiness/maturity of their followers for the specific task at hand. PARALLEL EVOLUTIONS: (a) PAUL HERSEY + CENTER FOR LEADERSHIP STUDIES (CLS, situational.com, founded 1969) - continues original Situational Leadership; uses TELLING + SELLING + PARTICIPATING + DELEGATING style labels + R1-R4 readiness levels; LEAD-Self + LEAD-Other multi-rater instruments; faculty + facilitators globally; CLS is operationally led by Sam Shriver + others after Hersey + Brigitte Hersey leadership. (b) KEN BLANCHARD + THE KEN BLANCHARD COMPANIES (kenblanchard.com, founded 1979) - evolved Situational Leadership II (SLII); uses DIRECTING + COACHING + SUPPORTING + DELEGATING style labels + D1-D4 development levels with named development states (Enthusiastic Beginner + Disillusioned Learner + Capable but Cautious + Self-Reliant Achiever); SLII Self + Other assessments + SLII certified facilitators globally; Ken Blanchard Companies operationally led by Madeleine Blanchard + others; Blanchard wrote Leadership and the One Minute Manager (1985) + many subsequent works. RELATIONSHIP: Hersey + Blanchard parted ways professionally in mid-1970s + each developed parallel evolved models with different terminology but same underlying conceptual framework. SUBSEQUENT EVOLUTION: ongoing model refinement + integration with newer leadership constructs + cross-cultural adaptation + AI-driven coaching applications. PRACTITIONER FOCUS: model is heavily practitioner-oriented (vs purely academic) + widely-used in corporate + military + public-sector + non-profit leadership development. NOTE: this rebuild describes conceptual framework via publicly known publications + does NOT reproduce CLS LEAD or Blanchard SLII assessment items + scoring + norms which remain copyrighted property of the respective organizations.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.