Miller Marital Locus of Control Scale (MMLOC)

Abstract

The Miller Marital Locus of Control Scale (MMLOC) is a specialized psychological assessment tool designed to measure an individual’s perception of control over outcomes within their marriage. Based on Locus of Control theory, the scale differentiates between individuals who attribute marital success and failure to their own actions and abilities (internal locus of control) versus those who attribute outcomes to external forces such as fate, luck, or uncontrollable circumstances (external locus of control). The MMLOC is crucial for research exploring relationship dynamics, marital satisfaction, and the efficacy of marital therapy interventions.

Keywords

Marital Locus of Control, MMLOC, Attribution Theory, Relationship Dynamics, Marital Satisfaction, Internal Locus of Control, External Locus of Control, Psychological Assessment

Authors

P. C. Miller, H. M. Lefcourt, W. E. Ware

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Purpose

The primary purpose of the Miller Marital Locus of Control Scale is to quantify the extent to which a spouse believes they possess control over the positive and negative events that occur within their intimate relationship. This measurement is vital for understanding the cognitive frameworks individuals use to interpret marital events, which subsequently influences their motivation to engage in problem-solving behaviors or relationship maintenance efforts.

By assessing both internal and external attributions, the MMLOC provides researchers and clinicians with a clear profile of how perceived control impacts relationship functioning. It helps predict active engagement in conflict resolution versus passive acceptance of relationship difficulties.

Construct

The MMLOC measures the construct of Marital Locus of Control, which is an application of Rotter’s generalized Locus of Control concept specifically tailored to the marital context. The scale operationalizes control along a continuum:

• Internal Locus of Control: Individuals scoring high on internality believe that marital outcomes (e.g., happiness, conflict resolution, sexual satisfaction) are primarily a result of their own behaviors, effort, and abilities.
• External Locus of Control: Individuals scoring high on externality believe that marital outcomes are determined by forces outside their personal control, such as luck, fate, or the unpredictable behavior of their spouse or external circumstances.

Furthermore, the MMLOC breaks down these attributions into specific sub-factors, allowing for a nuanced understanding of where control is perceived to reside: Effort, Ability, Context, and Luck.

Validity

The initial construction and development of the MMLOC, documented in the Canadian Journal of Behavioral Science (1983), suggests that the scale underwent rigorous psychometric testing to establish its validity. Construct validity was demonstrated through expected correlations with measures of marital adjustment and satisfaction, where an internal locus of control is generally associated with higher relationship quality.

Subsequent research, such as the 1986 study published in the Journal of Personality and Social Psychology, utilized the MMLOC to successfully predict differences in marital problem-solving behaviors, further supporting its predictive and criterion validity in clinical and research settings. The clear differentiation between internal and external items reinforces the theoretical structure of the scale.

Reliability

Reliability studies conducted during the scale’s development established strong internal consistency for the overall scale and its primary subscales (Internal and External). The development process ensured that items within each subscale measured the same underlying dimension of perceived control.

The MMLOC is expected to yield acceptable test-retest reliability, indicating that an individual’s general attributional style regarding their marriage is a stable personality characteristic over time, barring significant life events or therapeutic intervention.

Factor Analysis

The factor analysis of the MMLOC reveals a complex structure that goes beyond a simple internal-external dichotomy, identifying four distinct factors that contribute to the attribution of marital outcomes:

1. Effort: Attribution of outcomes to the amount of work or persistence applied in the relationship (Internal).
2. Ability: Attribution of outcomes to one’s interpersonal skills, competence, or aptitude in managing the relationship (Internal).
3. Context: Attribution of outcomes to uncontrollable external circumstances, environmental factors, or the unpredictable nature of the spouse (External).
4. Luck: Attribution of outcomes to chance, fate, or destiny (External).

The scoring key reflects this structure, categorizing items into broader Internal (Effort and Ability) and External (Context and Luck) domains for calculating the total Marital Locus of Control score.

Instrument

Test Type: Self-Report Questionnaire (Psychometric Scale)

Format: 5-point Likert Scale (ranging from -2, “I disagree very much,” to +2, “I agree very much”)

Language Available: English (Original)

Population Group: Married or Cohabiting Individuals

Age Group: Adults

Population Details: Developed primarily for use with adult populations involved in long-term intimate relationships, particularly married couples. The scale is relevant for clinical populations undergoing marital counseling and for general population research on relationship satisfaction.

Test Methodology: Respondents rate the extent to which they agree or disagree with 44 statements concerning the causes of events within their marriage. The scoring combines Internal and External scores, often weighted to produce a single measure of Marital Locus of Control (Score = 132 + External Score – Internal Score).

Keywords

Psychological Scale, Relationship Assessment, Marriage Counseling, Clinical Psychology, Rotter, Interpersonal Skills, Effort Attribution, Ability Attribution

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Authors

Author ORCID Identifier: N/A (Information not provided in source material)

Affiliation Email addresses: N/A (Information not provided in source material)

Correspondence Address: N/A (Information not provided in source material)

Permissions & Fee and Test Year

The Miller Marital Locus of Control Scale was first published in 1983. Permission for use in academic research generally relies on standard academic ethics, requiring citation of the original source (Miller, Lefcourt, & Ware, 1983). For commercial or clinical use, direct consultation with the copyright holders (typically P. C. Miller or the journal publishers) is recommended. The instrument is available for review in the Healthy Marriages Compendium. The original PDF can be downloaded here: Healthy Marriages Compendium.

Reference’s

• Miller‚ P. C.‚ Lefcourt‚ H. M.‚ & Ware‚ W. E. (1983). The construction and development of the Miller Marital Locus of Control scale. Canadian Journal of Behavioral Science‚ 15‚ 266—279.

• Miller‚ P. C.‚ Lefcourt‚ H. M.‚ Holmes‚ J. G.‚ Ware‚ E. E.‚ & Saleh‚ W. E. (1986). Marital locus of control and marital problem solving. Journal of Personality and Social Psychology‚ 51‚ 161—169.

• Corcoran‚ K.‚ & Fischer‚ J. (2000). Measures for clinical practice: A sourcebook (Vol.1). New York‚ NY: The Free Press.

• Robinson‚ J.P.‚ Shaver‚ P.R.‚ & Wrightsman‚ L.S. (Eds.). (1990). Measures of personality and social Psychological attitudes. San Diego‚ CA: Academic Press Inc.

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Items of the Miller Marital Locus of Control Scale (MMLOC)

IMPORTANT: The following scale items must be preserved in their original language and must not be changed in any way.

1. I am often at a loss as to what to say or do when I’m in disagreement with my spouse.

2. Sexual compatibility is something of a mystery to me; it is something that just happens.

3. Putting effort into the relationship will practically guarantee a successful marriage.

4. Difficulties with my spouse start with chance remarks.

5. If my marriage were to end in divorce‚ I would suspect that I had not tried hard enough to make it work.

6. The unhappy times in our marriage just seem to happen regardless of what I am doing.

7. Circumstances play a very limited role in causing marital satisfaction it is largely effort and concern that matter.

8. When things begin to go rough in my marriage I can see that I had a part in it.

9. Raising children effectively is really just a matter of trying one’s best; chance has absolutely nothing to do with it.

10. I find that external circumstances like day to day events can have considerable influence on how my spouse and I get along.

11. I can always bring about reconciliation when my spouse and I have an argument.

12. When I want my spouse to do something he/she hadn’t planned on‚ it’s often difficult to bring him/her around to my way of thinking.

13. Misunderstandings between my spouse and I are generally purely circumstantial.

14. Some effort on my part is all that is required in order to bring about pleasant experiences in our marriage.

15. having a satisfactory sexual relationship with one’s spouse is partly a matter of luck.

16. When we have unpleasant experiences in our marriage I can always see how I have helped to bring them about.

17. Circumstances of one sort or another play a major role in determining whether my marriage functions smoothly.

18. My spouse and I can get along happily in spite of the most trying circumstances if we decide to.

19. If parents discipline their children conscientiously they are sure to be well behaved.

20. If my spouse and I were to experience sexual difficulties‚ we would certainly be able to overcome them.

21. Successful child-rearing is a result of some good fortune along the way.

22. If my marriage were a long‚ happy one I’d say that I must just be very lucky.

23. Even with the most loving couples a mutually satisfying emotional relationship doesn’t just happen‚ it is the result of the couple working at it.

24. At times‚ there just doesn’t seem to be any way out of a disagreement with my spouse.

25. Is seems to me that maintaining a smooth functioning marriage is simply a skill; things like luck don’t come into it.

26. Good communication between spouses is simply a matter of learning and applying the skills; nothing can interfere with good communication.

27. It’s more often up to my spouse to make an argument end peaceably.

28. How well your kids grow up depends very much on external factors like what kind of neighborhood you live in.

29. If my sexual relationship with my spouse was not entirely satisfactory‚ I would say that I wasn’t putting enough effort into the relationship.

30. When I look over the course of my marriage I can’t help but wonder if it was destined that way.

31. Good clear communication between spouses doesn’t depend on things like compatibility or personality but on constant practice.

32. Couples who don’t run into any marital conflict at some point in their marriage have simply been very lucky.

33. A little planning can prevent most of the conflicts that occur between spouses over childrearing.

34. Problems in our marriage never seem to sort themselves out over time? we usually end up having to do something about them.

35. I seem to have relatively little influence over when the intimate moments in our marriage will occur; they seem to happen of their own accord.

36. My spouse and I get along well because we have the interpersonal skills? not because of things like luck or temperament.

37. My spouse’s moods are often mysterious to me in that I have little idea as to what may have set them off.

38. There are always things I can do that will help to end an argument with my spouse that leave us feeling better.

39. Some kids are unmanageable in spite of their parents’ best efforts at discipline.

40. Couples who have a satisfying emotional relationship are constantly trying to improve their relationship; a good relationship doesn’t just develop spontaneously.

41. When my spouse and I are communicating effectively we aren’t doing anything in particular to make it happen.

42. How well I get along with my spouse depends very much on how he/she is feeling that day.

43. Happy times in our marriage don’t just happen by chance; planning is usually required.

44. Something more than a couple’s intentions and abilities are needed to bring about a mutually satisfying emotional relationship; it’s really a kind of special magic that is there or isn’t.

***

Scoring Information:

Response scale: +2 = I agree very much, +1 = I agree a little, 0 = Neither agree nor disagree, -1 = I disagree a little, -2 = I disagree very much.

Score = 132 + external score – internal score

External Items: 1, 2, 4, 6, 10, 12, 13, 15, 17, 21, 22, 24, 27, 28, 30, 32, 35, 37, 39, 41, 42, and 44.

Internal Items: 3, 5, 7, 8, 9, 11, 14, 16, 18, 19, 20, 23, 25, 26, 29, 31, 33, 34, 36, 38, 40, and 43.

Factor Groupings:

• Effort (items): 3, 5, 7, 9, 14, 18, 23, 29, 31 and 40
• Ability (items): 8, 11, 16, 19, 20, 25, 26, 33, 34, 36, 38, and 43
• Context (items): 1, 2, 6, 10, 12, 13, 17, 24, 27, 28, 35, 37, 39, 41, and 42
• Luck (items): 4, 15, 21, 22, 30, 32 and 44