An NLRB union preelection campaign usually goes through several phases, which include:

a$.$ Contacting employees, determining interest, setting up an organizing committee, and building more interest.

b$.$ Planting 'union salts', contacting employers, determining interest, and assembling a list of potential members.

c$.$ Setting up an organizing committee, launching a public relations campaign, and building interest.

d$.$ Determining union dues, planting "union salts", and building interest.