All mixed up

I've been reading "Mixed Methodologies", Tashakkori and Teddlie (1998), and have come across the confusing fact that the following terms exist and need to be understood:

• mixed methods
• multiple methods
• mixed-up models
• mixed model
• "integrated methodoloical approach...to combine methods" Tashakkori and Teddlie (1998) p.13
• multimethod
• "triangulation of methods"
• monomethod
• multilevel
• multimodel
• "mixed-methodology designs" Creswell (1995)
• "methodological mixes" Patton (1990)
• mixed studies
• mixed methods
• multiple methods