I would add time and money ... you might also find some ideas in Gary Richardson's textbook on project management. Here's the link:

https://books.google.com/books?id=cJXaBAAAQBAJ&printsec=frontcover&dq=project+management+gary&hl=en&sa=X&ved=0ahUKEwj6joeTzYTaAhUCHqwKHZWGBzMQuwUIRDAE#v=onepage&q=project%20management%20gary&f=false

I would add time and money ... you might also find some ideas in Gary Richardson's textbook on project management. Here's the link:

https://books.google.com/books?id=cJXaBAAAQBAJ&printsec=frontcover&dq=project+management+gary&hl=en&sa=X&ved=0ahUKEwj6joeTzYTaAhUCHqwKHZWGBzMQuwUIRDAE#v=onepage&q=project%20management%20gary&f=false

Thank you @Daniel doss sure time and money are essential .i will see te textbook.

following paper may give more insight for developing construct for the study

https://pdfs.semanticscholar.org/f2a8/30c6b00ce9c29b37aed52f64928e033d194d.pdf

http://www.scientificpapers.org/wp-content/files/1595_Factors_Affecting_Contractors_Performance_in_Construction.pdf

Thanks Prof. Chaubey for research they are helpful.

Sería importante consultar los siguientes textos:

Manual de gestión de proyectos Universidad de Antioquia © Rubén Darío Gómez Arias Primera edición: 2009 ISBN: 978-958-714-281-5.

Nassir Sapag Chain Proyectos de inversión. Formulación y evaluación 2a edición Pearson Educación, Chile, 2011 ISBN: 978-956-343-107-0