Which types of organization structures exist beyond the classic line forms?

From line, functional, line-and-staff, committee, and matrix structures to modern forms: virtual, cellular, team, boundaryless, inverted pyramid, and lean & flat.

The full menu:

• Classic: Line — Functional — Line & Staff — Committee — Matrix
• Modern/flexible: Team structure — Boundaryless — Virtual — Cellular — Inverted pyramid — Lean & Flat

The trend across this list: away from fixed hierarchies and toward flexible, knowledge-sharing, team-based arrangements that respond faster to change — with the trade-off that authority, responsibility, and (security-relevant!) accountability become harder to pin down.

Tip: For each form, be able to answer three questions: Who commands? Who advises? Where does unity of command break? That triple distinguishes them all.

Go deeper:

• Organizational structure (Wikipedia) — a survey of the structure types (functional, divisional, matrix, flat, team, network).