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It is shown that no-collapse and collapse interpretations of quantummechanics give equal object states (which predict everything that isobservable) if one bases the relevant relations on the Von Neumann-L\"uders'projection'. This connection is elaborated in detail from simple to mostgeneral cases. Distinguishability of the two approaches, which exists inprinciple, is also discussed. In the very simple illustration of passing oneslit physical-insight difficulties in the collapse approach are indicated. Forthe purpose of interference between the two wavefunction components also theMaxh-Zehnder interferometer is discussed.

How Can the No-Collapse and the Collapse Interpretations of Quantum-Mechanics Give the Same Description?