Within this context, problem-based learning is based on four primary principles namely: it should be constructive, it should be self-directed, it should be collaborative, and it should be contextual (Dolmans et al. 2005).
Control is based on three primary actions: dial, toggle and button, allowing for a wide range of different controls.
The study was designed to compare the difference in treatment practices between the two time periods based on three primary outcomes.
Soil food webs are mainly based on three primary carbon (C) sources: root exudates, litter, and recalcitrant soil organic matter (SOM).
To help developers focus on development of more effective propagation plans, the Designing for Sustained Adoption Assessment Instrument (DSAAI) is based on three primary bodies of literature: (1) change theory, (2) instructional systems, and (3) effective propagation strategies.
MST also informs the estimate of individual tree bole diameter dbole (which aerial LiDAR does not measure directly) based on two primary size measures easily obtained from the aerial LiDAR: height h and canopy diameter dcan.
The Designing for Sustained Adoption Assessment Instrument is based on three primary bodies of literature: (1) change theory (Borrego and Henderson 2014; Henderson et al. 2011a; Henderson et al. 2012a), (2) the instructional system (Lattuca and Stark 2009; Lattuca 2011), and (3) effective propagation strategies (Fixsen et al. 2005; Cuban 1999).
Our team coded the content of each ad using four tenets: 1) whether content was positive, negative or comparative, 2) whether ads focused on issues, character or a combination of character and issue, 3) the emotional appeals used based on six primary emotions: anger, fear, sadness, joy, love and surprise, and 4) the subject matter.
The descriptions of facets here are based on three primary texts, Crompton [31], Butler [37], and López-Martínez [11].
