The phrase "a three step method" is correct and usable in written English.
You can use it when describing a process or approach that consists of three distinct steps.
Example: "To improve your productivity, follow this three step method: prioritize your tasks, set specific goals, and review your progress regularly."
Alternatives: "a three-part approach" or "a three-phase process".
In its most general and simple formulation, the design of persuasive technologies follows a three steps' method (Fogg 2009b): Get specific: clarify which behaviour you want to obtain, by translating your goals and targets into users' behaviours.
A thematic analysis of the content will be carried out using a three steps method described by Huberman and Miles [ 22]: data reduction, data display, and drawing conclusions/verification.
A two step method is proposed.
Here, a four step method is proposed that incorporates a feedback controller, and makes use of the closed loop sensitivity functions to indicate significant impact on the closed loop behaviour from a performed model simplification.
The binder-free TiO2 NWAs electrode anchored on the titanium substrate is prepared via a two step method combining a chemical oxidation (with melamine as soft-template) process with a pyrolysis process.
A flexible three-dimensional carbon cloth/carbon fibers/NiCo2O4 composite electrode is prepared via a two step method: first growth carbon fibers on flexible carbon cloth; second coating NiCo2O4 on the carbon cloth/carbon fibers composite.
A two step method was also used where the ferrocene powder was placed in the preheated zone for a certain time to deposit iron catalyst particles on the reactor wall prior to introducing the pure xylene into the reactor.
Poly DMA-b-NAS) block coPoly DMA-b-NASsynthesized by a two stePoly DMA-b-NAShich a poly(DMA) homopolymer was prepared first and then used as macro-chain transfer agent to polymerize NAS.
To this end, a PI+CI compensator has been designed by using a two step method: firstly, a robust base PI compensator is tuned by using the Quantitative Feedback Theory to satisfy (robust) relative stability and tracking specifications; and secondly, a partial reset action is added to the base lineal PI compensator to improve transitory response.
